<prompt> Sentinel loop on x-ray:Meckels diverticulumAcute cholecystitisAcute mesenteric adenitisAcute pancreatitis  <response>: Ans. d Acute pancreatitisRef: Bailey 26th ed. 1128-29 The most commonly recognized radiologic signs associated with acute pancreatitis include the following: Air in the duodenal C-loop The sentinel loop sign, which represents a focal dilated proximal jejunal loop in the left upper quadrant. The colon cut-off sign, which represents distention of the colon to the transverse colon with a paucity of gas distal to the splenic flexure. 