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Distended appendix 6 mm enhancing thickened walls

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Unformatted text preview: s of pancreas, invasion of adjacent organs, Ascites (presumtive peritoneal carcinomatosis) Appendicitis CT features? Distended appendix >6 mm, enhancing thickened walls, appendicolith within phlegmon or abscess DifferentialCrohn's disease, cecal diverticulitis, perforated cecal carcinoma, mesenteric adenitis, PID of RLQ pain without abnormal appendix or appendicolith? Complications associated with perforated appendicitis? Phlegmon (periappendiceal soft-tissue mass), abscess (> 3cm surgical or catheter drainage). Mucocele of appendix? Distended, mucus-filled appendix without inflammation. >2 cm, usually caused by mucinous neoplasm Diverticulitis CT features? Small, round collections of air, feces, or contrast, wall thickening, hyperemic enhancement, sinus tract or fistual formation, Abscess formation Colitides? Ulcerative colitis, Crohn's colitis, Pseudomembranous colitis, Typhlitis, Ischemic colitis (splenic flexure, rectosigmoid) Radiation colitis, Infectious colitis, Toxic megacolon CT features of islet cell tumors? enhance. Large tumors heterogeneous with calcification, cysts, necrosis, vascular invasion, tumor extension (generally nonfunctioning) Small tumors (<4 cm) Functioning isletglucagonomamalignant potential?10% insulinoma 80% cell tumors' 60% gastrinoma CT features of pancreatic lymphoma? and weakly enhancing. Diffuse infiltrative tumor resembles pancreatitis. Peripancreatic lymphadenopathy. No or minimal dilatation of pancreatic duct. Lymphadenopathy below renal veins in lymphoma but not in pancreatic adenocarcinoma? Focal tumor, homogeneous Metastases to pancreas CT features? Round or ovoid Most heterogeneous, can be diffuse, solitary, or multiple nodules Intraductal Diffuse ormucinous neoplasmof pancreatic duct, atrophy of pancreas, cystic ectasia of branch ducts "bunch of grapes", intraductal papillary solid mass, multicystic mass. papillary segmental dilation CT features? Pseudocyst CT features? cystic lesion in and around pancreas, low-density collections of fluid, debris, or blood, Distinct walls with occasional calcifications, Generally unilocular, Signs of pancreatitis usually present. Most common Pancreatic Middle-aged women, Multiloculated cysts, 6 or less cysts > 2 cm are typical, May have calcifications, Most common in tail, Do not communicate with pancreatic duct. mucinous cystic neoplasm CT features? Pancreatic Benign,cystadenoma CT features?of innumerable small cysts. May have central stellate scar with central calcification. With larger cysts may have honeycomb appearance, Unilocular form indistinguishable from mucinous cystic neoplasms. serous well-circumscribed mass Splenic cysts? Posttraumatic cyst (most common), Congenital epidermoid cyst, Echinococcal cysts, Pancreatic pseudocyst. Splenic microabscesses CT features? differential: lymphoma, kaposi's sarcoma, sarcoidosis, metastases. Multiple low-density lesions, Most common neoplasm of spleen? Hemangioma Rare primary malignancy of spleen? Angiosarcoma Multiple small focal splenicor TB. Histoplasmosis calcifications? Features ofLack of serosa, early spread, poor prognosis. 90% SCC 10% ADCA (Barrett's) Irregular wall thickening >3 mm Intraluminal polypoid mass Eccentric narrowing of lumen Proximal dilatation Metastases to lymph nodes and liver esophageal carcinoma? Esophageal leiomyoma features? Smooth, well-defined mass. Eccentric wall thickening, Leiomyosarcoma (heterogeneous, ulcerate) Esophageal varices, CT features? nodular and tubular...
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