[Table/Fig-6]:

(a) Cropped contrast enhanced computed tomography axial sections of the abdomen of a 74-year-old man showing peri-ampullary duodenal diverticulum with contrast alone as the content and nodular thickening of the wall (black arrows) causing distal common bile duct obstruction and upstream dilatation (red *).

(b) A 3D model on the axial images of contrast enhanced computed tomography of abdomen using 3D slicer software. I, II, III – 1^st, 2^nd and 3^rd part of duodenum; purple – duodenal diverticulum; blue – tumour arising from the wall of duodenal diverticulum; green – common bile duct; red- hepatic artery. Note the dilated common bile duct due to the compression of the tumour from the duodenal diverticulum.