This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gall Bladder & Bile Ducts, Subject name: Surgery
A case of acute cholecystitis now presents with acute pain sharp going to the back diagnosis 
Select and explain. 
A. Acute pancreatitis, B. Cholecystitis, C. Appendicitis, D. Aortic aneurysm
A: Acute pancreatitis
Answer: A: Acute pancreatitis 
Explanation: 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.* Patient's 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.