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Fig. 3A. —Duodenal diverticulum in 75-year-old man. Axial T2-weighted MR image obtained with HASTE sequence (TR/TE, infinite/67; flip angle, 150°) shows 25-mm cystic process (long arrow) in region of pancreatic head. Along ventral aspect of cystic process is focus of low signal intensity (arrowhead) that likely represents small amount of gas but was not identified as such. Note dilated pancreatic duct (short arrow) resulting from incidental polyp (not visualized) in distal common bile duct. Duodenal diverticulum was initially thought to represent mucinous cystic tumor.