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Medical Definition of Lesser pancreas
1. A portion of the head of the pancreas that hooks around posterior to the superior mesenteric vessels, sometimes into the "nutcracker" formed by the superior mesenteric artery and abdominal aorta. Synonym: processus uncinatus pancreatis, lesser pancreas, pancreas minus, small pancreas, uncinate pancreas, unciform pancreas, Willis' pancreas, Winslow's pancreas. (05 Mar 2000)