Fig. 11

Extension from adjacent tumor. Abdominal CT (a, b) shows circumferential wall thickening of the gastric antrum (arrows) extending through the pylorus into D1 and D2, where a polypoid-like lesion (arrowhead) narrows the lumen. CT of another patient (c) shows evidence of gastric adenocarcinoma (arrows) with duodenal invasion and hemorrhage (arrowheads) inside the duodenal lumen. Abdominal CT of other patient (d) shows a hypodense soft-tissue density mass (arrowhead) which was a pancreatic adenocarcinoma with invasion of the medial wall of D2 (arrow). Abdominal CT of a patient with a neoplasm of the hepatic flexure of the colon (e, f). An undefined mass apparently involves the duodenum (asterisk) and the colon. A small amount of positive oral contrast agent (arrowhead) is present within the mass. An image obtained caudally (f) shows oral contrast agent in the colon (arrowhead) without evidence of contrast in the jejunum (arrow), a feature related to a colo-duodenal fistula