Best modality for identifying intramural/intraluminal gallbladder (GB) gas (100% sensitive) Gas within pericholecystic abscess or free intraperitoneal air may be present with perforation Other CT findings similar to uncomplicated cholecystitis…
Sausage-like enlargement of pancreas (with smooth contour) and loss of normal pancreatic lobulations Hypoattenuating halo or capsule around pancreas Absence of retroperitoneal fluid, fluid collections/pseudocysts, or inflammation Less enhancement than…
Limited to bowel ± mesenteric nodes • Secondary lymphoma Involvement of spleen, liver, or thoracic nodes IMAGING • Intestinal metastases • Malignant melanoma is most common primary site Enhancing masses within SB mesentery…
Ascites may be slightly higher in attenuation (15-30 HU) on CT than simple ascites Internal complexity within ascites fluid (septations, debris) is common and easier to appreciate on MR or…
With periampullary tumors • Liver ± peritoneal metastases TOP DIFFERENTIAL DIAGNOSES • Pancreatic ductal carcinoma • Ampullary carcinoma • Intestinal metastases and lymphoma • GI stromal tumor (GIST) • Duodenal ulcer • Crohn disease • Tuberculosis • Annular pancreas…
Controversial whether CTA/MRA is superior to US for TIPS surveillance US is primary TIPS surveillance tool CTA or MRA indicated if US is technically compromised or equivocal TOP DIFFERENTIAL DIAGNOSES…
Associated with other diseases and drugs (e.g., myeloproliferative; immunosuppressives) Signs of portal hypertension are common (> 50%) • LRNs Multiple focal liver masses or nodules 0.5-5 cm in size with persistent…
Most common site of involvement is lung Also lymph nodes, spleen, liver, eyes, skin, salivary glands, nervous system, heart Less common: Bones, GI, GU • Most common abdominal imaging finding is…
Terminal ileum affected in minority of patients • Toxic megacolon Colon is dilated with loss of fold and mucosal pattern Ascites is common ± pneumatosis, pneumoperitoneum TOP DIFFERENTIAL DIAGNOSES • Granulomatous colitis…
Small free fluid, edema, and fat stranding in surgical bed with reactive subcentimeter lymph nodes in mesentery Mild biliary dilatation, gastrojejunostomy thickening, and pancreatic duct dilatation due to anastomotic edema…
