Biliary injuries are common after a cholecystectomy. One of the most important reasons for biliary injury during laparoscopic cholecystectomy (LC) is variant anatomy of the extrahepatic bile duct. Described in this report is a rare complication of a LC that included a posterior right sectoral duct injury. A 45- year-old woman was referred with peritonitis, including a large quantity of fluid in the abdomen. She had undergone an LC at a state hospital 14 days before the referral. Pouchography revealed a connection between the site of fluid collection and the posterior sector of the right main bile duct. An exploratory laparotomy revealed a dissected right posterior sector channel. A Roux-en-Y hepaticojejunostomy was constructed with no complication. Surgical experience, training, and maintaining a critical view toward safety are the most important factors to prevent bile duct injuries after LC. Care taken with anatomical variance of the extrahepatic biliary tree is also a key factor in the prevention of iatrogenic biliary injuries. Posterior sector injuries should be kept in mind; however, hepaticojejunostomy is a feasible method to overcome this potential complication after the elimination of any intra-abdominal infection.Keywords: Injury, laparoscopic cholecystectomy; posterior sector.