Fig. 1

Adenocarcinoma. Abdominal CT performed before (a) and after (b, c) iv contrast administration shows irregular circumferential asymmetric thickening of D3, causing deformity of the lumen (arrows). There is encasement of the superior mesenteric artery (curved arrow) and tumor thrombosis of the superior mesenteric vein (arrowhead), rendering the lesion surgically unresectable. There is also periduodenal fat stranding and adenopathy (circle). Abdominal CT (d) of another case of duodenal carcinoma with an ulcerated mass at D2 (arrows). Abdominal CT of yet another case of duodenal carcinoma (e); there is circumferential duodenal thickening (arrows) which caused luminal stenosis with proximal dilatation (asterisk). MRCP of another patient (f) showing a polypoid duodenal lesion (curved arrow) that caused CBD dilatation (arrow), which proved to be a duodenal adenocarcinoma