Atenolol

William C. Dooley, MD

• Director of Surgical Oncology
• Department of Surgery
• OU Health Sciences Center Surgeon
• OU Medical Center
• Oklahoma City, Oklahoma

Lipoma arteria spanish buy discount atenolol 50 mg on line, aggressive fibromatosis (desmoids) arrhythmia 2013 purchase 50 mg atenolol otc, nerve sheath tumors blood pressure too low atenolol 50 mg order visa, myxomas and soft tissue secondaries tend to be multiple arteria rectalis media cheap atenolol 50 mg buy on-line. In these cases arrhythmia treatment guidelines order genuine atenolol on-line, it is helpful to have a clinical history of trauma, use intravenous gadolinium chelate and perform a plain radiograph to assess the presence of calcification. Myositis ossificans can produce an intense diffuse enhancement, but hematoma does not enhance. Infection can also mimic a malignant soft tissue tumor and clinical history is important in this regard. Subsequent work has shown that signal intensity patterns are not a good discriminator between benign and malignant tumors. Definite characterization of tumor types into benign and malignant is difficult, but it is useful to assess various criteria (Table 1), which can help make the distinction. In contrast, the well-defined homogeneous lesion that does not invade adjacent bone and neurovascular structures and maintains soft tissue planes is suggestive of a benign process. A significant proportion of malignant soft tissue tumors may have well-defined margins with a so called pseudocapsule and relatively homogeneous signal intensity. It is important that the full extent of any soft tissue mass together with its relationship to the adjacent joint and surrounding anatomical structures be clearly demonstrated. Intravenous contrast is useful if a lesion is not pure blood, pure water or pure fat. If the lesion enhances, a tumor should be suspected and biopsy of the enhancing area be obtained. The staging of soft tissue sarcomas is determined by the size of the tumor, the histologic grade, and lymph nodal spread or distant metastases. There is, however, difficulty in separating the changes related to recent treatment, particularly radiotherapy. Radiotherapy may result in soft tissue trabeculation, increase in fatty marrow as well as focal marrow abnormalities. Rarely, patients may develop radiation-induced malignancies in the irradiated field. Chemotherapy-induced hemorrhage may result in an increase in the size of the mass. Recurrent tumor appears as a discrete nodule or mass with signal characteristics that characteristically mirror those of the original tumor. Use of unenhanced T1-weighted fatsuppressed and gradient-echo sequences helps differentiate post-treatment hemorrhage from tumor recurrence. The locations include intramuscular, intermuscular, subcutaneous,and intra-articular/periarticular. An extensive lesion may be multicompartmental and the differential diagnosis of such lesions is angiomatous lesions, neurofibromatosis, fibromatosis, lipomatosis, myxoma (Mazabraud syndrome), metastases, or lymphoma. An intracompartmental lesion refers to one that has not crossed any natural anatomic boundaries. These boundaries may be cortical bone, articular cartilage, joint capsule, major fascial plane, tendon, or ligament. Idiopathic calcification or calcinosis in previously normal tissues with normal serum levels. Metastatic calcification is commonly widespread, fairly symmetrical and bilateral in distribution. Dystrophic calcification is usually limited to the site of injury and tends to be more focal and asymmetrically distributed. Substances on the skin, such as lead ointment or pigments used in tattoos, may cause confusing opacities. Abnormal tissue calcification can be subdivided into three major categories (Table 2). Metastatic in previously undamaged tissues, with elevated serum of calcium and phosphate levels. Arterial and cartilaginous calcifications are well recognized in hyperparathyroidism. Arterial calcification is frequently seen in patients on renal dialysis and in this group one may also find quite gross periarticular calcification similar to the appearance of tumoral calcinosis. This may occur with relatively normal values of serum calcium and appears to be related to the rising levels of serum phosphate. A severe form of the disease affecting children under 10 years of age causes extensive muscle damage and fibrosis with particularly widespread calcification. Radiographically, soft tissue calcification is indistinguishable from idiopathic calcinosis universalis. In the latter condition the diagnostic areas are hands and feet, where soft tissue calcification is associated with characteristic shortening of the first, fourth and fifth metacarpals and metatarsals. Of the parasitic infestations, cysticercosis cellulosae is the most common cause of soft tissue calcification, seen in Asian subcontinent. They appear to have a predilection for skeletal muscle, subcutaneous tissue and brain. Calcification may occur as part of healing process of any infective lesion but is particularly associated with tuberculosis where calcified lymph nodes are commonly seen. It is, therefore, common in patients with diffuse systemic sclerosis (scleroderma). The calcium deposits are often very dense and sharply localized near the fingertips with associated soft tissue loss. Vascular Calcification Atheromatous calcification is an inevitable consequence of aging and may range from localized irregular plaques to extensive tram-like calcification involving most of the aorta and pelvic vessels and extending into lower limbs. Mural calcification in a vein is rarely seen, but calcified phleboliths are extremely common Dermatomyositis Dermatomyositis is more common in women in their third to fifth decade. Idiopathic Calcification Idiopathic Calcinosis Universalis Idiopathic calcinosis universalis is a rare disorder of unknown cause affecting infants and children. Radionuclide scan will show intense increase in uptake over all the areas of involvement. Soft tissue uptake on isotope bone scanning can occur before the ossification is evident radiographically. The basic defect is the inappropriate differentiation of fibroblasts into osteoblasts following an inflammatory lesion in the soft tissues. Calcinosis Circumscripta Deposits of calcium in subcutaneous tissues in a circumscribed form occur in a variety of diseases most frequently in and around joints. Myositis Ossificans Myositis ossificans is a benign, self-limiting response to soft tissue injury. The reactive lesions are composed mainly of hypercellular fibrous tissue which evolves into mature bone. Bone formation usually becomes evident within 6­8 weeks after the onset of symptoms. After muscle damage, what initially may appear to be a hematoma can subsequently show the fine, lacy calcification. During the first 2 weeks following trauma, a warm and painful soft tissue mass develops. In the subsequent 2 weeks, amorphous densities develop in the mass possibly with periosteal Tumoral Calcinosis the condition consists of large painless juxta-articular calcified masses, frequently in soft tissues of hips, shoulders, elbows or smaller joints. The etiology is unknown, but a metabolic defect and trauma are considered as some of the factors. The condition becomes manifest in second to third decade with the majority of individuals having an inborn error of phosphate metabolism. On radiographs, loculated dense homogeneous masses of calcification occur in the periarticular soft tissues. There is usually, however, a thin line of separation between the ossification and adjacent bone which helps in differentiation. Subsequently, the posttraumatic myositis ossificans matures (ossifies) in a peripheral to central pattern and is associated with a reduction in the size of the mass, factors which also help to distinguish it from a malignant process. Intermediate lesions are similar but typically demonstrate a rim of curvilinear decreased intensity at the periphery corresponding to ossification. Mature (late) lesions are well-defined inhomogeneous masses with a signal intensity approximating that of fat on T2 and T1-weighted images. A rim of decreased signal intensity is seen around the lesion with similar areas of ossification within, with no evidence of associated edema. The soft tissues around the elbow and thigh are common sites for developing this complication. Repeated minor trauma may result in bone formation, particularly in tendinous or ligamentous insertions. The bone, which is usually attached to the underlying skeleton, is frequently extensive, tending to invest neighboring joints in coarse amorphous bands. Myositis Ossificans Progressiva (Fibrodysplasia Ossificans Progressiva) Myositis ossificans progressiva: It is an inherited disorder with autosomal dominant inheritance. It is characterized by congenital malformations of the great toes and progressive heterotopic ossification, which appears in specific anatomic patterns. The disorder usually manifests between birth and 10 years with abnormal ossification first commencing in the neck, then on the shoulders, arms, chest and eventually on the feet. On the other hand, stippled and curvilinear calcifications are typical of cartilaginous tumors, such as soft tissue chondroma and chondrosarcoma. As detailed peripheral calcification may be seen in myositis ossificans, and also in ossifying fibromyxoid tumors. Other tumors that may show calcification are lipoma, liposarcoma, malignant fibrous histiocytoma, synovial sarcoma, and rhabdomyosarcoma. Air Formed within the Soft Tissues Air within the skeletal soft tissues usually arises as a result of infection. Soft tissue injury, especially if associated with extensive muscle damage and foreign body penetration as in shrapnel wounds may be complicated by infection with anaerobic organisms, particularly clostridia. This may take the form of cellulitis which tends to be confined to the superficial tissues where pockets of gas may be visible radiographically. Radiological feature of gas gangrene which 3308 Section 7 Musculoskeletal and Breast Imaging distinguishes it from anaerobic cellulitis, is the pectinate appearance of gas infiltrating individual groups of muscle fibers. Manipulation of such injuries may cause air to be sucked into the wound, particularly if there are torn or retracted muscles. Though the clinical presentation of acute lesions is characteristic, these may simulate a malignancy in a subacute or chronic clinical scenario. An abscess, on the other hand, appears as a welldefined focal fluid collection that is hypointense on T1W and hyperintense on T2W with rim enhancement. Displacement or obliteration of the translucency in front of the elbow suggests presence of a fracture, and is a useful sign in diagnosing occult fractures. The fat then floats on the blood and a horizontal ray film of the injured area may show fat blood interface. Fat containing masses (lipomas/liposarcomas) may also be recognized as translucent areas within muscles. Soft Tissue Tumors Soft tissue tumors are a heterogeneous group of lesions which arise from different nonepithelial, extraskeletal elements, which include adipose tissue, smooth and skeletal muscle, tendon, cartilage, fibrous tissue, blood vessels, and lymphatic structures. They are relatively uncommon lesions that occur in the trunk, extremities or head and neck. The nine major groups of tumors under this pathological classification system include adipocytic tumors, vascular tumors, fibroblastic/myofibroblastic tumors, fibrohistiocytic tumors, smooth muscle tumors, skeletal muscle tumors, pericytic (perivascular) tumors, chondro-osseous tumors and tumors of uncertain differentiation. Peripheral nerve sheath tumors are not included in the classification but are discussed here as these show relatively characteristic imaging features. Septic bursitis usually results from invasion of bacteria through a skin abrasion. The specific anatomic location is the clue to the diagnosis, however, only needle aspiration of the distended bursa can confirm the sepsis. Ultrasonography demonstrates exact location of the cyst, relationship with adjacent structures and nature of the cyst fluid or septations within the cyst. It is usually a solitary lesion (although multiple lesions may be present occasionally) and is composed of mature adipose tissue. Amongst these, lipoblastoma is a tumor of immature fat which occurs in young children. Amongst these, the well-differentiated form is the most common (50%), and it does not metastasize. Soft tissue hemangiomas represent a broadspectrum of benign endothelial neoplasms that histologically resemble normal blood vessels. Hemangioma may be divided into common hemangiomas of infancy, congenital hemangiomas, and kaposiform hemangioendothelioma. The proliferative phase is during the first few months of life and Vascular Lesions Benign vascular lesions can broadly be divided into two distinct groups: hemangiomas and vascular malformations. While the former are considered as true neoplastic lesions, vascular malformations are disorders of vascular morphogenesis. Vascular lesions are the most common soft tissue lesions in children and young adults. The lesion size tends to stabilize by about 9 to 10 months of age, after which the involuting phase continues slowly for the next several years up to 7­10 years of age. Noninvoluting hemangiomas grow proportionally with the child without undergoing involution and may present in adulthood. Common sites of hemangiomas include face and neck (60%), trunk (25%) and extremities (15%). Deeper lesions however, in which the overlying skin may be normal or have only slight bluish discoloration. Areas of highsignal intensity representing fat or slow flowing blood may be seen as fine delicate lace-like strands to thick coarse bands. On T2-weighted images, soft tissue hemangiomas reveal a well-marginated mass with very high-signal intensity in areas of vascular components, whereas regions of adipose tissue are of intermediate intensity or isointense to subcutaneous fat. The areas of high-signal intensity are caused by vessels with slow flow and are seen as circular and/or linear or serpentine vessels.

A rebiopsy is essential if the sample is considered inadequate for definitive pathological diagnosis blood pressure unsafe levels atenolol 50 mg order fast delivery. Imaging-histologic discordance is a situation when imaging findings are not consistent with the pathology report pulse pressure 2013 atenolol 50 mg buy without prescription. It is also being used for high-risk screening and preoperative staging of breast cancer heart arrhythmia xanax order atenolol 50 mg free shipping. It allows access on lateral aspect of breast only and hence blood pressure chart hong kong cheap atenolol 50 mg with mastercard, medially 3382 Section 7 Musculoskeletal and Breast Imaging pleomorphic microcalcifications is not expected heart attack grill quadruple bypass burger purchase atenolol from india. Imaging histologic-discordance occurs in 3­7% of core biopsies and malignancy is found in about one-fourth of these cases on surgical excision. Close audit of the biopsy results at an individual center should be regularly performed to maintain the standard and accuracy of breast biopsy. Overall, malignant results are expected in 20­40% of all breast biopsies performed. This means that some lesions which could have been cancers, are not being recommended for biopsy and therefore, missed. With development of accurate percutaneous core biopsy techniques, hookwire localization is now rarely performed for initial diagnosis. At present, it is mainly used as a preoperative localization procedure for therapeutic excision (breast conservation surgery) of already diagnosed but nonpalpable breast cancer. Hookwire localization prior to breast conservation surgery helps to precisely resect the cancer with clear margins. Indications of hookwire localization for diagnostic surgical excision biopsy include nonavailability of stereotactic biopsy facility or re-biopsy after inconclusive or discordant percutaneous core breast biopsy. It is also recommended for biopsy of vaguely defined breast abnormalities lesions; such as suspicious focal asymmetry or architectural distortion without associated mass. Needle localization for excision biopsy helps to achieve accurate lesion retrieval with minimal removal of breast parenchyma. Early preoperative localization procedures were performed using various types of dyes, such as methylene blue or evans blue, mixed with iodinated contrast. The dye was injected in the lesion through a needle introduced under mammographic guidance. However, spread of the dye and amount of tissue stained was unpredictable, leading to missed lesions or excision of much larger breast tissue than actually required. Charcoal powder was also used instead of aqueous dyes, so as to restrict the spread over large area, but this was also not very accurate. Accuracy and reliability of preoperative needle localization greatly improved after the development of various needle­hookwire combinations. It consists of a 20 G needle and a thin flexible wire which can be introduced through it. After correct needle placement, the hookwire is introduced and needle withdrawn over it. A modification of this hook-wire has a thick stiffened segment just proximal to the hook. This rigid segment of wire is useful to the surgeon as it allows manual palpation of the target lesion intraoperatively. Some versions of hookwire have double folded hook forming a barb, which prevent their displacement with in or out of the breast. Another type of needle hookwire assembly has a retractable curved J-tip instead of the angled hook. If final hookwire position is unsatisfactory, the curved part of the wire can be retracted back into the needle and repositioning can be performed. The needle stays in the breast after deployment and it provides a stiff guide to the surgeon. However, it may also be performed under ultrasound guidance if the lesion is clearly defined on ultrasound. There are radiopaque alphanumeric centimeter markers on the margins of the window. The fenestrated compression plate has rows of multiple small round holes, like a sieve, instead of a single open window. This type of compression is not preferred by many, as lesion frequently gets positioned under the solid part of the plate, rather than under the hole. Both digital and film based mammography machines are suitable for needle localization. However, digital systems are preferred as images at each step are immediately available and procedure is therefore much faster. Technique Films on the basis of which needle localization has been recommended are reviewed and appropriate guiding modality and approach is selected. Informed consent inclusive of needle localization and excision is usually obtained by the surgeon. Mammographic needle localization is performed with the patient in a sitting position. An approximate area of lesion, based on the baseline films, is marked on the skin and breast is positioned in the craniocaudal view. The breast is compressed with the alpha-numeric window compression plate, with skin mark in the center. If the lesion is seen well within the window, its x and y axis location is determined using the alpha-numeric markers in the image. The point is marked on the skin at the crossing of same coordinates, as visible on the compression plate. Availability of movable cross-hair shadow marker in the light beam of mammography unit is greatly useful to mark the exact point on the skin. After the skin entry point is marked, skin is prepared and local anesthetic is injected. If the target lesion is a mass or architectural distortion, care should be taken not to inject too much local anesthetic as it can obscure lesion. The localization needle without hookwire is then inserted vertically into the breast. Too improve the accuracy of needle hitting the target, the light beam of the mammography unit is turned on during insertion. This maintains the needle in the direction of the X-ray beam and the needle remains perfectly perpendicular to the lesion. Needle positioning is inaccurate if some length of the shaft is seen or if the needle is more than 5 mm away from the target. While the compression is being released, the breast bounces back and this may cause needle tip to come out from the lesion. To prevent this, the needle should be firmly supported and mild pressure is maintained to keep the needle tip deep in the breast during compression release. If the needle is not held, the needle hub may get entangled at the border of the compression plate window and come out with it. The breast is then repositioned in orthogonal (mediolateral) view using same compression plate. The needle should be seen crossing the lesion with tip about 1 cm beyond the lesion in this image. If this is not the case, then needle should be withdrawn accordingly while the breast is still compressed. Exact length to be withdrawn can be determined with the help of centimeter markings seen in the image. After needle tip adjustment, the hookwire is inserted into the needle with the hook closed. The outside wire is then firmly held in position and needle withdrawn over it, releasing the hook in the breast. Wire should not be pushed during the withdrawal of the needle, as the hook may move further beyond the lesion, especially in fatty breasts. Procedure is considered successful if the hookwire is in the lesion or within 1 cm of it. If the wire is further away, procedure should be repeated with additional hookwire placement. The wire entry site is lightly covered with a gauze piece taking care that the wire is free to move in and out of the breast with changes in breast shape in supine and erect position of the patient. The wire should not be plastered to the breast at the skin entry site; otherwise the hook end of the wire inside the breast may get dislodged as the patient moves. The patient is then sent to the operation theater along with post-localization film, with lesion marked on it, and a written note about the procedure and final hookwire-lesion relationship. Rarely, a separate incision is made guided by the palpation of the thickened part of the wire and lesion approached. The breast tissue around the hook and the thickened wire segment is resected and sent to the mammography room for specimen radiography. Its coordinates are determined in this film and skin entry point is marked; (B) Needle is inserted vertically. Note that the needle entry point is in the center of the shadow of the hub; thereby ensuring correct needle alignment in the direction of X-ray beam; (C) Another film is obtained. Needle is seen end on with its hub overlapping the lesion in this view; (D) Mediolateral view obtained thereafter shows that the needle tip has just crossed the lesion (arrow). Then the hookwire is inserted and the needle is withdrawn; (E) Post-hookwire localization mammogram shows hookwire anchored correctly within the lesion (arrow); (F) Specimen radiograph of the excised tissue confirms accurate removal of the lesion (arrow) with good margins, has been removed within the resected specimen. The specimen mammogram must be correlated carefully with baseline mammogram for this purpose. This is especially important if the lesion has calcifications; all foci of suspicious calcifications should be within the specimen. If the lesion is incompletely seen or seen extending up to the margins, this should also be communicated in details, so that additional resection at the appropriate site is attempted. These mainly include Chapter 202 Breast Interventions 3385 vasovagal reaction, bleeding and pain. Unusual complications include hooking of pectoralis muscle and pneumothorax due to entry of the needle into the chest. Migration of the hookwire after successful placement is an uncommon but serious problem. Risk factors for this include entirely fatty breast, excessive arm movements after the wire placement and delay in surgery. If the surgeon is not familiar with this procedure, he should be cautioned about these complications. Special Techniques of Localization Placement of two or more hookwires in the same breast may be required for multiple lesions or to mark the extent of a large lesion (Hookwire Bracketing) before breast conservation surgery. Needle localization can be accurately and quickly performed under ultrasound guidance and this modality should be preferred if the lesion is visible on ultrasound. Another advantage of ultrasound-guided needle localization is that it can be performed with anterior approach. As with mammographic needle localization, postlocalization mammogram and specimen radiography should also be performed after ultrasound-guided localization. Hematoma-guided localization has also been found useful for breast conservation surgery of nonpalpable breast cancers. If the biopsy result is malignant and surgery is planned within 4­5 weeks, the small hematoma can be identified with intraoperative ultrasound. This can be used as a guide for dissection, without the need for any preoperative localization procedure. Indications of ductography include spontaneous solitary duct discharge that is serosanguineous, or bloody. Causes of such duct discharge are papilloma, fibrocystic disease, duct ectasia and carcinoma. A 27 or 30 G ductography cannula is used which is connected to a syringe containing 3­5 mL of nonionic contrast. The cannula is then securely taped on the breast and mediolateral and craniocaudal mammographic views are obtained. The size of the ductal territory is highly variable; this may be a small segment of the breast or it may cover a large area of the breast. Normal ducts show uniform and orderly branching of the ducts with smooth tapering from nipple to periphery. Beaded appearance of the duct with multiple opacified cysts is seen in fibrocystic disease. Breast cyst aspiration may also be performed for symptomatic relief of large simple breast cysts. Needle tip is seen within the cyst with accompanied reverberations characteristically seen during cyst aspiration procedure is morbid and many of the patients develop shoulder stiffness and lymphedema of the arm subsequently. Sentinel lymph node staging helps avoid axillary lymph dissection in some of the patients who do not have axillary lymphadenopathy on clinical examination. In this procedure, a dye and radionuclide (99mTc labeled sulfur colloid) is injected around the tumor. The first node draining the tumor area is localized with scintigraphy probe and excised. If this node is not pathologically involved, distal axillary lymph nodes are considered to be disease free and axillary dissection is avoided. However, the technique of sentinel lymph node staging is cumbersome, time consuming and expensive. Patients with confirmed axillary lymph node involvement can then be spared of sentinel lymph node staging and directly taken for axillary lymph node dissection. On ultrasound, size criteria or Doppler evaluation are not useful for identification of abnormal axillary lymph nodes. However, these procedures have reasonable potential to become an option for minimally invasive treatment of breast cancer in future, if large studies and long-term results are available. Palpable breast masses: is there a role of percutaneous imaging-guided core biopsy Rate of insufficient samples from fine needle aspiration for non-palpable breast lesions in an multicenter clinical trial: the Radiologic Diagnostic Oncology Group 5 study.

The paramidline cysts are Wolffian cysts arrhythmia yahoo answers atenolol 100 mg buy on line, seminal vesicle cysts or ejaculatory duct cysts which contain sperms blood pressure medication with diabetes discount 100 mg atenolol. Ultrasonographic anatomy of normal prostate gland: Reconstruction by computer graphics arrhythmia when sleeping buy generic atenolol 100 mg line. Pathologic basis of the sonographic appearance of the normal and malignant prostate arrhythmia institute newtown purchase atenolol amex. Clinical evaluation of trans-rectal power doppler imaging in the detection of prostate cancer blood pressure chart for women order 100 mg atenolol with visa. Carcinoma of the prostate; value of transrectal sonography in detecting extension into the neurovascular bundle. Use of endorectal surface coil magnetic resonance imaging for local staging of prostate cancer. Preliminary results of endorectal surface coil magnetic resonance imaging for local staging of prostate cancer. Prostate cancer: Comparison of local staging accuracy of pelvic phased-array coil alone versus integrated endorectal-pelvic phased-array coils. Farsad M, Schiavina R, Franceschelli A, Sanguedolce F, Castellucci P, Bertaccini A, et al. Cystic disease of the kidney can be divided into two broad categories: congenital and developmental or acquired disorders. The congenital disorders include autosomal dominant and autosomal recessive polycystic disease, tuberous sclerosis, von Hippel­ Lindau disease and medullary sponge kidney. Sometimes, these masses cannot be diagnosed because of overlap in appearance between benign and malignant lesions. Masses with calcification, high attenuation or high signal intensity or thin septations are probably benign and need a follow-up, while a multiloculated lesion with enhancing walls or nodularity suggests an aggressive nature and requires surgery. Therefore, it becomes a very important for the radiologist to make the critical differentiation between atypical benign cysts and cystic tumors. The developmental process initially begins as a solid mass of cells which later cannulates to form the lumen. Most congenital cystic disorders are the result of an arrest in cannulation and communication at various stages of development. An awareness about the pathology of each cystic disease is of immense help in the understanding of the corresponding radiological images. Cysts containing one or two nonenhancing thin internal septae (<1 mm wall thickness) with no thickened elements. The permanent kidney or metanephros develops following the contact of the metanephric diverticulum or ureteric bud with the metanephric mesoderm. During the fourth week of gestation, a dorsal bud of the metanephric diverticulum grows out of the mesonephric duct into the mass of metanephric mesoderm; thus, during the fifth week of gestation, the metanephros is induced to develop metanephric tubules in its caudal portion. The blind end of the collecting tubules then induce clusters of mesenchymal cells to develop into metanephric tubules of the nephron. Further development of the permanent kidney occurs through both, the growth in the absolute number 1680 Section 4 Genitourinary Imaging Table 1: Classification of renal cystic diseases Nongenetic 1. Abnormality of the renal contour or adjacent fascial planes, displacement of bowel loops or splaying of ribs. Filling defects in the opacified cortex during the nephrographic phase of urography. Color Doppler flow imaging and Duplex Doppler sonography can aid in determining the presence or absence of vascularity and flow patterns which provide a clue regarding the benign versus malignant nature of renal cystic masses. A lesion that contains fluid and has no blood supply remains water dense after contrast administration but solid tumors appear relatively dense in contrast to enhancing parenchyma. Enhancement depends upon the dose and rate of administration of iodinated contrast and the timing of imaging. The nephrographic phase is the most valuable for detecting mass lesions less than 3 cm which include clinically insignificant renal cysts and renal cell carcinomas. However, morphological features, such as wall thickening or nodule make the lesion suspicious even without enhancement especially in the case of papillary cancers. This is of great significance in patients with very small cysts which may contain foci of malignancy as in Ultrasonography Gray-scale, real-time sonography is the primary imaging modality for evaluation of renal cystic disorders. It is a noninvasive, multiplanar direct imaging modality, which requires no patient preparation, and unlike excretory urography it shows the mass lesion itself, along with changes in the renal parenchyma and tubular anatomy. It can almost always differentiate a cystic from a solid mass and simple cyst from cystic dysplasias associated with complications. Tissue harmonic imaging is useful for identifying isoechoic lesions and small renal cysts which may be indistinguishable 1682 Section 4 Genitourinary Imaging von Hippel­Lindau disease. Uncommonly, thin septa divide the cyst into multiple chambers that may or may not communicate with each other. Calcium may deposit in the wall or septa of a simple nephrogenic cyst in the absence of any complication such as hemorrhage or infection. Occasionally, solid renal tumors may obstruct the tubules of adjacent normal parenchyma resulting in tubular dilatation and secondary cyst formation. Therefore whenever a simple cyst is detected, the adjacent parenchyma should be carefully evaluated for the presence of an adjacent solid mass. T1- and T2-weighted images are acquired in the axial planes and often in the coronal and sagittal planes as well. Large cysts may present as palpable mass, flank discomfort/pain, occasionally with hematuria or hypertension, proteinuria or polycythemia. Renal function is generally preserved in the host kidney regardless of size or position of the cyst. However, in the present era, it is mainly indicated for interventional procedures of vascular and mass lesions of the kidney. Treatment of actively bleeding tumors, such as angiomyolipomas can be done through selective angiography by embolization of the intrarenal supply of the tumor. Simple uncomplicated cysts present as round, smooth, radiolucent filling defect in the nephrogram and frequently show a beak at the interface of the cyst with the rest of the parenchyma, and there is absence of any definable wall. Sometimes, even abscesses and hypovascular renal cell carcinomas resemble simple cysts on urography; therefore, further investigation of the cystic mass by ultrasound becomes necessary. If these features are present, a simple cyst can be diagnosed and no further follow-up or intervention is required, provided there are no complicating clinical features to suggest the possibility of other significant lesion. They are homogeneous and do not show calcification or enhancement after intravenous contrast is administered. Lesions that fulfill these criteria are simple cysts which do not require further intervention. For minimizing the errors in measurement created by partial volume averaging, the slice thickness should be less than half the diameter of the lesion. It may result from hemorrhage into a simple cyst or organization of a liquefied hematoma. Approximately 6% of simple cysts are complicated by hemorrhage, which is usually the result of trauma, varicosities in the cyst wall or a bleeding diathesis. Imaging features: On excretory urography, a hemorrhagic cyst presents as a lucent mass. As the blood liquefies and organizes, there may be a decrease in attenuation and increase in wall thickness with heterogeneous internal contents due to clot and debris. The methemoglobin in a hemorrhagic cyst alters its appearance, so that the lesion has an intermediate to high signal intensity on T1-weighted images. Signal intensity on T2-weighted images varies depending on whether or not the red cell lysis has occurred. The overlapping, variable signal intensities of hemorrhagic cysts and tumors with hemorrhage blur the distinction between benign and malignant cystic masses. Pathology: Infected cysts often have markedly thickened walls that are occasionally calcified. Their contents consist of varying amounts of inspissated pus and fluid as well as calcified and noncalcified debris. Rarely, an air-fluid level may be seen when the cyst is infected by a gas-forming organism. Gas transmits the sonographic beam poorly and is suspected when intense specular echoes and ill-defined shadowing are recognized. Cyst rupture may be clinically silent or may be accompanied by severe pain and abdominal tenderness. On angiography, it may be recognized as a focal blush in a larger hypovascular mass. In these differentiation from cystic neoplasms, infectious diseases and other renal cystic disorders may be difficult. Calcified Cyst About 1­3% of cysts are calcified and the calcification is usually peripheral and curvilinear. A measurement or washout of contrast material from a lesion at 15 minutes allows differentiation between hyperdense cysts and renal tumor. There is no change in hyperdense cysts while tumors show a decrease in attenuation or "deenhancement". It is thought to represent hemorrhage into a cyst while other explanations for a hyperdense cyst include high protein content, high viscosity and solidified colloid. Careful examination is required because some hyperdense masses Septated Cysts Occasionally one or more septa are identified within a renal cyst, which may be a manifestation of two adjacent cysts sharing a common wall or a cyst, complicated by hemorrhage or infection. A septated cyst can be considered nonsurgical if the septae are 1 mm or less without any associated nodularity. It is a systemic hereditary disorder with characteristics like cyst formation in ductal organs, particularly the kidney and liver, and gastrointestinal, cardiovascular and musculoskeletal abnormalities. It is proposed that the disorder results from failure of union of the branches of ureteral bud with metanephros, which deprived of the organizing influence from cysts. Localized Cystic Disease these represent dilated ducts and tubules which vary in size from a few millimeters to several centimetres. Between the cysts, normal renal parenchyma without neoplastic or dysgenetic stroma is seen. On sonography, multiple small cysts often present as one large multiloculated mass. The most important differential diagnosis is a multiloculated neoplasm which can be differentiated by the absence of capsule between the cluster of cysts and normal Pathology There is cystic dilatation of nephrons involving all segments from proximal convoluted tubule to collecting duct due to epithelial hyperplasia leading to redundancy and predisposing to cyst formation. With minimal disease, the kidneys are normal in size with smooth surface but with increase in the size and number of cysts, the kidneys are asymmetrically enlarged with bosselated surface contour; however, the reniform shape is maintained. Progressive azotemia ensues as renal parenchyma is destroyed and renal failure occurs in most patients by the age of 60 years. Complications include superimposed infection, cyst hemorrhage, uric acid stones and hypertension. The presence of atleast two renal cysts (unilateral or bilateral) in individuals, at risk and younger than 30 years, may be considered sufficient to establish a diagnosis. Among the patients aged 30­59 years, the presence of at least two cysts in each kidney may be required and among those aged 60 years and above, at least four cysts in each kidney should be present. Plain films reveal bilateral enlarged kidneys with lobulated margins causing displacement of surrounding structures like colonic flexures. Calcification may be curvilinear or amorphous and presence of renal calculi often signifies superimposed infection. An appearance of spidery collecting system with stretched and crescentric calyces may be noted. Its frequency has been reported as between 1 in 6000 and 1 in 55000 births, and the responsible gene has been mapped to chromosome 6. In the kidney, the disorder manifests as nonobstructive collecting duct ectasia, usually in a bilaterally symmetric fashion with enlargement of the kidneys. Fibrosis develops in the renal interstitium resulting in impairment of renal function and consequent hypertension, dilute urine and renal failure. In infancy or childhood the hepatic abnor-malities secondary to congenital hepatic fibrosis predominate with milder renal disease. Generally, the hepatic and renal involvements are inversely proportional to each other in individual patients. Bilateral symmetrically enlarged kidneys with severe oligohydramnios and a nondistended fetal bladder with thoracic cage compression are typical features seen in the third trimester. Plain films reveal abdominal distension with centrally placed gas filled bowel loops. With severe kidney disease, the baby may be born with pulmonary hypoplasia and a small thorax with evidence of pneumothorax. Ureteral obstruction may result when calculi are extruded into the collecting system. The disorder is typically bilateral, although it may be unilateral or rarely involves only one pyramid. Its true prevalence in the general population is unknown but is estimated to be 1 in 5000 persons. It is characterized by dilatation of the papillary portions of the ducts with presence of small intraluminal calcification. Calcification is either due to distal renal tubular acidification defect or due to urinary stasis in the dilated collecting ducts. Patients usually present in the third or fourth decade with renal colic, hematuria, dysuria and fever. In the juvenile form inherited as an autosomal recessive disorder, 1690 Section 4 Genitourinary Imaging the children present with hyposthenia, anemia and growth retardation and it is associated with ophthalmologic and neurologic abnormalities, congenital hepatic fibrosis and related dysplasia. The adult form presents in the 2nd­4th decades, typically with no extrarenal manifestations and is inherited as an autosomal dominant mode. Both of these forms progress to renal failure; hematuria typically is not present. Most often, there is atresia of the ureter and renal pelvis (pyeloinfundibular atresia). The hydronephrotic form is seen if incomplete but severe obstruction occurs early in nephrogenesis resulting in a dilated renal pelvis. Potter described two subtypes of renal dysplasia depending on the size of renal cysts.

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Normal marrow on this sequence produces low-signal intensity because of the combined effects of fat water nulling and magnetic field heterogeneity due to normal trabeculae blood pressure medication pros and cons buy atenolol 50 mg with visa. The diffuse pattern is due to increased cellularity and decreased signal intensity on T1W images blood pressure jokes buy discount atenolol. These are: (i) normal appearing marrow with low-grade interstitial infiltration blood pressure medication names starting with m atenolol 50 mg with mastercard, (ii) focal pattern blood pressure medication yeast infections atenolol 100 mg generic, (iii) diffuse (iv) mixed focal and diffuse arteria gastroepiploica dextra atenolol 50 mg purchase without prescription, and (v) salt and pepper appearance. The disease is initially seen as a focal decrease in intensity which becomes diffuse with progression of the disease. The change of bone marrow is associated with increased contrast enhancement which correlates with the cellularity indices and possibly reflects the number of intramedullary plasma cells. Hematogenous, beginning in the metaphysis of long bones, juxtachondral portion of flat bones or spiral end plates. In neonates the intact vascular communication between metaphysis and epiphysis leads to epiphyseal involvement in up to 70%. Between 1 year and skeletal maturity the cartilage provides a barrier to joint involvement except in the hip where the femoral head is intra-articular. In adults the location of infection depends on the mechanism and the presence of medical conditions, such as diabetes, spinal cord injury, etc. Acute osteomyelitis causes marrow replacement due to infiltration by inflammatory cells, hemorrhage, fibrin, debris and edema. Contrast enhancement of the infected bone is intense with a surrounding rim of enhancement while in septic arthritis there may be a small amount of subarticular marrow enhancement. Hence, the location and volume of marrow abnormality allows differentiation of osteomyelitis from sympathetic marrow changes. Secondary signs of infection, such as cellulitis, cortical disruption, sinus tracts, soft tissue abscesses and periosteal reaction help distinguish osteomyelitis. Cortical destruction with cloacae formation seen in anterior aspect of femur, posterior aspect of patella, joint effusion with edema seen in muscles-Chronic osteomyelitis of femur with intramedullary abscess and associated infective arthritis Chronic osteomyelitis exhibits the same signal pattern as acute osteomyelitis but the foci are surrounded by a sclerotic rim seen as a signal void which clearly delineates the extent of the lesion. Sequestrated bone appears as a signal void while infarct is seen as "double line" with associated muscle infarction. Intraosseous abscess may be seen in chronic infections following surgery or trauma. A lowsignal intensity rim is seen on all sequences secondary to fibrosis or reactive bone formation. The myeloid depletion manifests as cytopenia of the erythrocytes, leukocytes and thrombocytes. There is a resultant decrease in the cellularity due to decrease in the hematopoietic marrow which is replaced by fatty marrow. Causes have not been identified but provoking factors are viral infections, drugs, toxic substances, hepatitis and unknown causes. Aplastic anemia is a panmyelopathy thought to result from suppression of the multipotent myeloid cells with decrease in the erythroid, 3278 Section 7 Musculoskeletal and Breast Imaging After treatment, recovering marrow is seen as areas of decreased signal intensity within the background of fatty marrow. The hematopoietically active cell nests return mainly in the marrow space of the vertebral body. Primary myelofibrosis is rare in children and is generally seen post-chemotherapy or radiation therapy for leukemia, lymphoma or metastasis. In adults myeloproliferative disorders, metastasis, leukemia, lymphoma, tuberculosis and toxins are the varied causes. This results in extramedullary hematopoiesis in liver and spleen and immature blood cells in the peripheral blood. In myelofibrosis the predominant radiographic feature is osteosclerosis that may be found in 30­70% of the patients and it is most evident in the bones of the axial skeleton in particular spine and pelvis. Accumulation of these cells leads to osteoporosis, localized destruction and ischemic necrosis. Infiltration of the marrow with Gaucher cells increases the T1 relaxation time and shortens the T2 relaxation time causing a low-signal intensity of the affected marrow on both T1W and T2W images. These appearances are similar to those in other infiltrative processes but the low-signal intensity on T2W images allows differentiation from tumor processes. Iron overload (Hemosiderosis): this disorder can be primary or secondary following multiple transfusions and hemolytic anemias. Magnetic resonance imaging: the iron deposition can be patchy or uniform in distribution involving the pelvis, spine and metaphysis or diaphysis of long bones. Excessive iron deposition can cause nearly a complete signal loss resulting in a "black marrow"31,32,37. The early findings are marrow edema and necrosis seen as increased signal intensity. Band like pattern of peripheral intermediate signal intensity due to red marrow around a central zone of high-signal intensity due to fatty marrow. Postradiation changes are dose related and preferentially affect the hematopoietic marrow. A distinct horizontal demarcation between normal 3280 Section 7 Musculoskeletal and Breast Imaging and damaged marrow is often seen and the visualization of changes depends on the magnetic field strength. Correct diagnosis is imperative to avoid unnecessary biopsies and to guide proper clinical management. The fracture lines usually parallel to the sacroiliac joints and show ill-defined margins in all sequences. Cases of osteonecrosis of the jaw in patients treated with bisphosphonates have been recently and increasingly reported. Multiple areas of red marrow develop in conjunction with increasing neutrophil counts. The signal characteristics of the changes in marrow are similar to those of red marrow in both pediatric and adult patients. The antiangiogenesis is intended to stop cancer progression by suppressing tumor recruitment of new blood supply. Thus, a successful therapeutic inhibition of angiogenesis can be expected to slow or stop tumor growth, but not to cause tumor regression or disappearance. Signs of a response to this treatment are rather a delayed, less steep and smaller bone marrow enhancement after intravenous administration of small molecular Gd-chelates compared to pretreatment studies. The treatment induced change in tumor pH with an alkaline shift is related temporally to increases in the phosphodiester/ beta-adenosine triphosphate ratio and occurs before alterations in tumor size are documented. About 3­4 weeks into chemotherapy, reconversion from fatty marrow to hematopoietic marrow can occur, and is readily recognized as it usually occurs in the reverse sequence of marrow conversion, both bilaterally and symmetrically. After chemotherapy, depletion of hematopoietic marrow may result in predominantly fatty marrow. In children, methotrexate can cause osteopenia, severe bone pain and metaphyseal insufficiency fracture (described as methotrexate osteopathy). In breast cancer treatment, both hormonal therapy with aromatase inhibitors in postmenopausal women and chemotherapyinduced ovarian failure in premenopausal women can cause significant loss of bone mass, increasing the risk of fractures. Chapter 197 Magnetic Resonance Imaging in Bone Marrow Disorders 3281 spectral profile of the serum changes in responding patients resemble that of normal serum with typical higher peak intensities as compared to nontreated and nonresponding patients. During the first post-transplantation days, the bone marrow shows a decline in signal intensity on T1-weighted images and an increased signal intensity on T2-weighted images, probably due to a treatment-induced edema. This band consists of a peripheral T1-hypointense zone and a central T1-hyperintense zone. At histologic examination, the peripheral zone corresponded to repopulating hematopoietic marrow and the central zone to marrow fat. Subsequently, the band pattern gradually evolves into homogeneous appearance of the marrow after successful bone marrow transplantation. For example, sharply defined focal lowsignal intensity areas of marrow on T1-weighted images have been reported in patients who are in complete remission after transplantation. Spectroscopy, perfusion studies or markers of tumor cell proliferation help to differentiate these residual marrow abnormalities. Vascular obstruction occurs in the venous system in the epiphysis of long bones and in small carpal or tarsal bones. Ischemia may lead to bone infarct or osteonecrosis depending on its severity, size and location. Hematopoietic cells die within the first 6 hours of anoxia while osteocytes, osteoblasts and osteoclasts survive up to 48 hours. An adequate circulation allows repair to begin with a fibrous demarcation of necrotic area. Magnetic resonance imaging: In the early stages when the radiograph is normal, focal subchondral lines of altered signal intensity, low-signal intensity on T1W and high on T2W images due to free water are seen. A "double line" sign consisting of two parallel stripes of low and high-signal indicate irreversibility. Magnetic resonance imaging: In the early stage there is decreased signal intensity on T1W and increased signal intensity on T2W images due to accompanying edema. Infarcts in the late stages are generally calcified seen as decreased signal intensity on all sequences. Due to the partial blood supply to the peripheral marrow cavity, the infarct exhibits a peripheral line due to a subcortical double contour giving the "bone in bone" appearance. Marrow edema is the first and often the only manifestation of a osseous disease process. Bone bruises are most often seen in the juxta-articular and subchondral areas of the distal femur and proximal tibia in association with ligamentous and meniscal injuries. Stress fractures are caused by an imbalance between the strength of the bone and the stress applied. Magnetic resonance imaging can visualize the pathophysiologic changes accompanying a stress fracture. The signal void band represents trabecular microfractures and intratrabecular callus formation. Differentiation of stress fractures from occult intraosseous fractures is difficult. Stress fractures are almost always metaphyseal or diaphyseal while occult fractures are typically subchondral or epiphyseal and have a precipitating cause. A number of bone marrow pathologies are characterized by a depletion of normal hematopoietic bone marrow cells. A number of pathologies go along with increased or decreased vascularity of bone marrow. Effects of trabecular bone on the appearance of marrow in gradient-echo imaging of the appendicular skeleton. Normal age-related patterns of cellular and fatty bone marrow distribution in the axial skeleton. Regression of bone marrow haematopoiesis from the terminal digits in the foetus and infants. Changes in T1 relaxation processes in the bone marrow following treatment in children with acute lymphoblastic leukemia. Pro-longed T1 relaxation of haemopoietic bone marrow in patients with chronic leukemia. The detection of bone marrow involvement by lymphoma using magnetic resonance imaging. Magnetic resonance differentiation of acute and chronic osteomyelitis in children. The emergency radiologist plays a key role in the work-up of such patients as the initial evaluation requires radiographic examination. It provides diagnostic evidence of the presence of fracture or dislocation along with the severity and extent of the trauma. The radiographs are also essential to check for accuracy of fracture reduction and to monitor bone healing. It is important to assess the state of the circulation and neural integrity in the limb distal to the fracture, both at the time of initial presentation and after any intervention. The radiologist should also be aware of the mechanism of the injury as well as the time interval from the injury to the radiographic examination. The radiologist can also look for specific injuries that are known to be associated with the mechanism of the injury. This makes the open fractures amenable to the risk of infection because of contamination by microorganisms. The radiographic evaluation of fracture should work on the basic principle of obtaining at least two views of the involved bone, ideally perpendicular to each other, with each view including two joints adjacent to the involved bone. This helps the radiologist eliminate the risk of missing an associated dislocation or subluxation at a site remote from the apparent primary injury. Additional views should be obtained if there is any doubt or in specific situations like an oblique view for scaphoid fracture. In children, especially if there is involvement of the ossification centers which are not fused, it may be necessary to obtain a radiograph of the normal, unaffected side for comparison. The complete radiographic evaluation of a trauma patient should consist of the following: 1. A dislocation is a complete disruption of a joint with loss of congruity between the articular surfaces. Subluxation is a minor disruption of the joint where some part of the articular surfaces remain in contact. A fracture can appear as any of the following-an obvious disruption in continuity of bone, abnormal line of radiolucency, cortical irregularity or increase in bone density (due to impacted or compression fractures). Torus (buckling) fractures: Fractures occurring due to longitudinal compressive forces over a soft bone of young child. It occurs when the force on the bone is not sufficient enough to cause a cortical disruption but instead leads to bowing of the bone. Direction of Fracture Line this is described with respect to the longitudinal axis of the bone. In long bones Anatomic Location and Extent of the Fracture When describing a fracture it is important to specify the location within the long bone. In case of a fracture involving shaft of a long bone it should be described whether it is located in proximal, middle or distal thirds of bone or at junction of any two parts.

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