<prompt> A case of acute cholecystitis now presents with acute pain sharp going to the back diagnosisAcute pancreatitisCholecystitisAppendicitisAortic aneurysm  <response>: Ans. a Acute pancreatitisRef: Sabiston 20th edition Page 1496 Gall stone pancreatitis: As GB stone passes the common channel it irritates the Pancreatic system and causes pancreatitis. Patients will have continued back pain even after stone passes. Most cases of gall stone pancreatitis settles by conservative management. If symptoms do not resolve we do ERCP and Sphincterotomy. Dilated CBD and CBD stone gives suspicion of Gallstone pancreatitis. Patient should be operated in same admission before discharge- Laparoscopic cholecystectomy During surgery Intra op Cholangiogram is done to rule out CBD stones. 