Detailed knowledge of the vascular anatomy of hepatobiliary system is important for a safe cholecystectomy. We are reporting a case of aberrant type of right hepatic artery originating from superior mesenteric artery and encircles the gallbladder that has been found during laparoscopic cholecystectomy operation. We presented a 39-year-old Malay lady came to International Islamic University Malaysia Medical Centre with features of obstructive jaundice. Ultrasound of hepatobiliary system showed cholelithiasis with choledocholithiasis causing dilatation of the common bile duct. ERCP had been performed and sphincterotomy was done. Patient was planned for laparoscopic cholecystectomy. Intraoperatively, the Calot’s triangle was identified in usual manner. However, the right hepatic artery was identified encircling the gallbladder body anteriorly before entering the liver. The procedure was converted to open cholecystectomy due to anatomical variation via Kocher’s incision. Further identification upon open cholecystectomy revealed right hepatic artery originates from superior mesenteric artery runs anterior to cystic duct and encircles the gallbladder before further branches into right and left lobe of the liver. Right hepatic artery was dissected from the gallbladder and the gallbladder removed after cystic duct ligation and separation from the liver bed. On table cholangiogram showed distal CBD stone which was pushed down to duodenum with forceps? Post-operative was uneventful and patient liver functions improved. Knowledge regarding anatomical structure and variant of hepatic artery as well as cystic artery and cystic duct is important to ensure the inadvertent ligation of right hepatic artery which would leads to hepatic ischemia and necrosis.

Introduction and importance Gastric outlet obstruction can result from any pathological process that causes intrinsic blockage or extrinsic pressure on the distal stomach and duodenum. Gallstone related gastric outlet obstruction is a well-known entity classically due to a cholecystoenteric fistula formation. Case presentation We present here a case of a 36-year-old man who presented with right upper quadrant abdominal pain associated with marked nausea and vomiting. Abdominal CT scan done in the emergency department revealed a large impacted infundibular gallstone with signs of acute cholecystitis, associated with prominent gastric distention. Gastric outlet obstruction was due to stenosis at the duodenal level from external compression by the large impacted stone with no evidence of fistula. Laparoscopic cholecystectomy was performed with total resolution of symptoms. Clinical discussion Gastric outlet obstruction can be secondary to many etiologies, and notably gallstone disease. Classically this is due to formation of a cholecystoenteric fistula and intrinsic obstruction by the migrated stone. Our case is unique in that a large impacted infundibular gallstone caused gastric outlet obstruction with absence of any fistula or gallstone migration. Conclusion Gastric outlet obstruction due to external compression by a non-migrated gallstone is a rare undescribed entity. Surgical treatment should not be delayed to prevent complications and fistula formation.