Figure 1.

A, CT axial image of the abdomen demonstrating cystic structure containing oral contrast material. B, Endoscopic view of septum between lumens. C, Endoscopic view of native lumen with diverticulum located superiorly. D, Endoscopic view within the distal end of the diverticular lumen. E, Endoscopic view after resection. F, Gross specimen taken for pathologic examination. G, Microscopic low-power view demonstrating duodenal mucosa lining both surfaces and dilated submucosal vessels (hematoxylin phloxine saffron, orig. mag. × 20).