RT Book, Section A1 Doherty, Gerard M. SR Print(0) ID 58092285 T1 Annular Pancreas T2 Quick Answers Surgery YR 2010 FD 2010 PB The McGraw-Hill Companies PP New York, NY SN LK accesssurgery.mhmedical.com/content.aspx?aid=58092285 RD 2024/10/16 AB • Ring of pancreatic tissue from the head of the pancreas surrounds the descending duodenum, leading to obstruction, presenting either in infancy or adulthood• Vomitus is bilious if obstruction is distal to the ampulla of Vater• Air in the stomach and duodenum proximal to the obstruction on abdominal x-ray (double bubble sign)