[Two cases, of pulmonary sclerosing hemangioma, and peripheral lung carcinoid, in which the diagnoses were difficult by intraoperative frozen section examinations].

Case 1: A 38-year-old man was referred to our hospital because of a chest nodular shadow found on a medical check-up. Chest CT showed a mass about 2 cm in diameter with a sharp margin in the right S6 segment. Right lower lobectomy was performed by video-assisted thoracoscopic surgery, because the mass was thought to be a peripheral lung carcinoid by intraoperative frozen section examination.