Gallstone ileus 30 years after cholecystectomy and hepaticojejunostomy.

Gallstone ileus occurs when the small or large intestine is obstructed by a gallstone and is a rare occurrence in a post-cholecystectomy patient. Non-specific clinical symptoms and inconsistent imaging results often lead to a delay in diagnosis. Complex anatomy, such as a Roux-en-Y biliary-enteric anastomosis, can increase the risk of stone formation and further confound a potential case of gallstone ileus. Here, we present a rare case of gallstone ileus at the anastomosis site of a Roux-en-Y hepaticojejunostomy done 30 years prior for a common bile duct injury during a cholecystectomy. The possibility of negative CT findings, pattern of presentation on imaging as intussusception, and potential pathomechanism of gallstone formation in post-cholecystectomy patients are discussed. Through this case and review of similar cases, we emphasise the need for further study of post-cholecystectomy gallstone ileus and the importance of clinical suspicion during diagnosis.