Colonic Diverticulosis
CT shows diverticula as outpouchings from colonic wall, filled with gas or feces Circular muscle hypertrophy (myochosis coli) causes irregularly spaced indentations and narrowing of lumen of colon TOP DIFFERENTIAL…
Post-Transplant Lymphoproliferative Disorder
Site of presentation may depend partially on transplanted organ Extranodal (80%) > nodal involvement (20%) • Imaging findings of post-transplant lymphoproliferative disorder parallel those of non-Hodgkin lymphoma (NHL) in immunocompetent patients…
Pancreatobiliary Parasites
CT: Linear high-density foci within dilated biliary tree US: Tubular echogenic structure, 3-6 mm in diameter, with central anechoic area (digestive tract of worm) • Clonorchiasis: Flukes typically involve peripheral intrahepatic ducts,…
Pancreatic Metastases and Lymphoma
Can be solitary (73%), multiple (10%), or diffusely infiltrative (15%) Enhancement pattern mimics primary tumor – Hypervascular: Most commonly renal cell cancer (RCC) – Hypovascular: Lung, breast, colon, melanoma Concomitant intraabdominal metastases…
Esophageal Perforation
Majority are due to esophageal instrumentation Confirmed by contrast esophagram or CT, which are complementary • Cervical esophageal perforation (EP) Subcutaneous or interstitial emphysema; neck and mediastinum Consider perforation of Zenker…
Radiation Enteritis and Colitis
Multiplanar CECT, enteroclysis, barium enema • Single or multiple stenoses (strictures) of varying length (up to several cm) • Acute: CT submucosal edema (near water density) Fluoroscopy: Bowel loops appear spastic (↓…
AIDS Cholangiopathy
Diffuse GB thickening ± sonographic Murphy sign in setting of acalculous cholecystitis • MR: Papillary stenosis with tapered narrowing of distal CBD and proximal CBD dilatation ± long-segment extrahepatic bile duct strictures…
Hiatal Hernia
Sliding (axial) hiatal hernia (HH): Gastroesophageal (GE) junction and gastric cardia pass through esophageal hiatus Paraesophageal (rolling) hernia: Gastric fundus ± other parts of stomach herniate into chest • Surgical classification…
Congenital Abnormalities of the Gallbladder
Agenesis of GB: Congenital absence of GB Hypogenesis of GB: Rudimentary or atretic GB Bilobed GB: 2 completely divided GB cavities with a common cystic duct Duplicated GB: Duplicated GB…
Arterioportal Shunt
Wedge-shaped area of hyperattenuation with straight margins seen during arterial phase of CECT or MR Becomes isodense to hepatic parenchyma during portal venous phase of CECT or gadolinium-enhanced MR • Peripherally…
