[Isolated gallbladder agenesis without biliary atresia in a 16-year-old boy]

We present a case of a 16-year-old male patient with recurrent abdominal pain in the upper right quadrant, signed up for elective laparoscopic cholecystectomy due to a single gallstone seen on preoperative abdominal ultrasound. Because of dilatation of the common bile duct subsequent magnetic resonance cholangiopancreatography was performed, and surprisingly, the gallbladder was found missing. The operation was therefore cancelled. Even though gallbladder agenesis is a rare condition, it still represents a diagnostic challenge as most cases are found peroperatively, and the patients undergo unnecessary surgery.