Knowledge of congenital anomalies in abdominal viscera is important for surgeons, if they are to treat such patients and solve their problems adequately. This article presents an unusual case of reversed rotation of the intestine associated with anomalies in the biliary tract and gallbladder. This patient underwent surgery because of a bleeding duodenal ulcer. During surgery the following viscera positions were detected: the gallbladder was located to the left of the round ligament, the choledochus was in front of the first portion of the duodenum, the small intestine was in the left portion of the abdomen, and the colon was exclusively at the right side of the abdomen. This reversed rotation is a rare condition, only occasionally reported in the literature. However, the simultaneous association with anomalies in the gallbladder position (in the left lobe) and the biliary tract (the choledochus located in front of the duodenum) makes this a case unlike any other described in the medical literature.