Although intrathoracic liver in association with a congenital diaphragmatic hernia has been well documented, the finding of intrathoracic ectopic livertissue in the presence of an intact diaphragm is an extremely rare congenital anomaly. We have experienced a case of intrathoracic ectopic liver without any diaphragmatic hernia. A 37-year-old woman was admitted for the treatment of an incidentally detected right lung mass. A chest computed tomography scan revealed a right lower lobe lung mass close to the diaphragm, and this was suspicious for bronchial carcinoid tumor. Upon surgery, 2 round solid masses 3.5x3.5 cm and a 2.0x2.0 cm in size were noted, with their bottoms attached to the diaphragm dome. The masses were completely resected. Histologically, they were confirmed to be intrathoracic ectopic livers. The patient had an uncomplicated postoperative course.