TY - CHAP M1 - Book, Section TI - Annular Pancreas A1 - Doherty, Gerard M. PY - 2010 T2 - Quick Answers Surgery 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) SN - PB - The McGraw-Hill Companies CY - New York, NY Y2 - 2024/10/15 UR - accesssurgery.mhmedical.com/content.aspx?aid=58092285 ER -