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Fig. 4A. —Duodenal diverticulum in 54-year-old woman. Axial T2-weighted MR image obtained with HASTE sequence (TR/TE, infinite/67; flip angle, 150°) shows 15-mm cystic process (long thick arrow) in region of pancreatic head that was initially thought to represent intraductal papillary mucinous neoplasm. Along lateral aspect of cystic process is focus of low signal intensity (long thin arrow) that likely represents small amount of gas but was not initially interpreted as such. Note second cystic area (short thick arrow) just dorsal relative to cystic process; this area was initially thought to represent third portion of duodenum.