Location: Medial (70%) descending duodenum in periampullary region, 3rd or 4th portion (26%), lateral (4%) descending duodenum Filling defects within diverticulum (food and gas) CT: Fluid-filled diverticulum may simulate cystic…
“String of pearls” or “grapes on a stem” are common appearances • Usually multiple Discrete, linear, or confluent configuration • Size is variable, up to 2.5 cm • Smooth and thin walls; no…
Rectal mucosa protrudes no more than 1 inch below anus (shown on defecography) • External (complete) prolapse (procidentia) All layers of rectum protrude through anus Diagnosis made on physical exam or…
Start with nonionic, low osmolar, water-soluble contrast medium (e.g., Omnipaque) – Concern for aspiration and fistula Follow with barium if no leak or fistula • Acute radiation esophagitis (RE) Superficial ulcers; shallow,…
Pressure necrosis of bowel lumen (rectum or sigmoid) by fecal mass IMAGING • CECT to evaluate for perirectal and intraperitoneal complications Fecaloma: Entirely intraluminal mass Calcification or high-density matter in or…
Can be found in intrahepatic or extrahepatic ducts and range in size from a few mm (most common) to a few cm Tumors may secrete mucin: Wide-open ampulla of Vater…
Enlarged ileocecal valve with smooth or lobulated surface contour Stellate folds may radiate into center of mass Oblique images: Terminal ileum entering ICV • CT IC valve leaflets appear thickened with…
No enhancement on CECT Calcification may be seen • MR characteristics are secondary to low cellularity, vascularity, and water content of lesion Low signal intensity on all sequences (T1WI and T2WI)…
Distal duodenum and jejunum are most often involved, with distal small bowel/ileum involved in severe cases Thickened, irregular folds with sand-like micronodules Small bowel lumen may be normal or mildly…
“Eosinophilic gastroenteritis” is a misnomer; can affect any portion of GI tract • Requires 4 criteria for diagnosis Presence of GI symptoms Biopsy proof of eosinophilic infiltration of 1 or more…
