Ten-month old girl who underwent reduced-size liver transplantation for biliary atresia. Five days after transplantation she developed abdominal pain and fever. An ultrasound scan of the abdomen was performed, demonstrating the presence of free fluid around the liver and between the small bowel loops. The patient underwent explorative laparotomy that revealed choleperitoneum secondary to a biliary leak from the hepaticojejuneal anastomosis. The leak was successfully treated by revision of the anastomosis.