Diagnosis requires excluding other causes of biliary dilatation, including tumor, stone, or stricture Commonly associated with cholelithiasis, cystolithiasis, choledocholithiasis, and hepatolithiasis • Classified into 5 types based on Todani classification Type I:…
Head and uncinate process of pancreas drained by ventral pancreatic duct of Wirsung via major papilla Body and tail of pancreas drained by dorsal pancreatic duct of Santorini via minor…
Microcystic adenoma (i.e., classic serous cystadenoma) – Honeycomb or sponge pattern with innumerable internal tiny cysts, enhancing septations, and central scar with calcification Macrocystic serous cystadenoma (usually unilocular) – 10-25% of all…
CT: Homogeneous soft tissue mass in right abdomen with adjacent suture line at duodenal stump MR: Normal pancreatic parenchyma is isointense to renal cortex on T1WI and isointense to muscle…
Several different possible imaging appearances – Mass completely replacing gallbladder (GB) (2/3 of cases) – Irregular focal or diffuse GB wall thickening (20-30%) – Intraluminal polyploid GB mass (∼ 20% of cases) Typically…
Best radiographic alternative to optical colonoscopy Proper technique critical, including utilization of colon cleansing agent, stool “tagging” agent, electronic CO₂ insufflator, and separate supine and prone acquisitions Polyps appear as…
Most common type; “upside-down stomach” Occurs in setting of large paraesophageal hernia Stomach rotates upward, with greater curvature lying above lesser curve • Mesenteroaxial volvulus: Rotation of stomach about its short…
Findings identical to calculous cholecystitis (except gallstones) Thickening of gallbladder wall > 3 mm Positive sonographic Murphy sign – May be absent or impossible to elicit in critically ill patients at…
Favors distal small bowel (SB) and colon Mucosal hyper- or hypoenhancement; submucosal edema Infiltration of mesenteric fat Lymphadenopathy is very uncommon • Mycobacterial Mycobacterium avium-intracellulare (MAI): Thickened SB folds with relatively…
Pruned appearance of biliary tree develops over time • CT/MR Thickening and hyperenhancement of bile duct wall suggests active inflammation Visualization of greater than expected number of peripheral ducts on MRCP…
