[A case of pulmonary hamartoma and sclerosing hemangioma in the same lung]

A 49-year-old woman was referred to our hospital because abnormal masses had been found in the left lung on chest radiography. This examination and CT scanning on admission both revealed a 12 x 8 mm mass in the left S5 and a 31 x 25 mm mass in the left S8. Calcification was not found in the tumors. Bronchoscopy showed narrowing of the left B5 and B8 bronchi by irregularity of the mucous membrane. No malignant cells were found in the cytological specimens, which were obtained by brushing and washing of the bronchi. Although the radiological findings suggested benign tumors, surgical resection was performed to confirm the diagnosis. The tumor in the left S5 was diagnosed as a hamartoma because it contained cartilage, lipoid tissue and lymphatic follicles. The tumor in the left S8 was diagnosed as a sclerosing hemangioma because vasculo-capillary formation by the cells with epithelial origin was seen. The pathological diagnosis of the two tumors differed, but a similar mechanism of tumorigenesis was suggested.