A newborn case of congenital solitary nonparasitic cyst of the liver was reported here. A large intra-abdominal cystic mass was found through antenatal ultrasonic examination in the 31th week of pregnancy. At the birth, a large abdominal mass was notified by palpation. Series of preoperative examinations suggested a large cyst in the abdominal cavity. The removal of the cyst was performed on the 33th day of life. At the operation, a large solitary cyst was identified originating from the antero-inferior margine of the right lobe of the liver and contained approximately 220 ml of straw colored fluid. The cyst was resected up to the liver edge. Postoperative course was uneventful and the liver regeneration was pretty good 6 months after operation.
