Figure 12c. Intraluminal duodenal diverticulum in a 61-year-old woman with abdominal pain. (a) CT scan shows a debris-filled intrinsic "windsock" diverticulum (large arrowhead) that distorts the pancreas (short arrow) and the second portion of the duodenum (small arrowhead), part of which is well enhanced (long arrow). The diverticulum simulates a pancreatic mass. (b) MPR image demonstrates the diverticulum (T), which distorts the pancreas (short arrows) and the second and third portions of the duodenum (arrowhead) and simulates a pancreatic mass. Long arrow indicates the ligament of Treitz. (c) VR image demonstrates the diverticulum (T) within the proximal jejunum (arrow). The diverticulum distorts the pancreas (P) and duodenum (arrowheads), thereby simulating a pancreatic mass.