Abstract

Fibrous histiocytoma had been introduced by Brunn in 1939 as a name of "tennis ball tumor", and also diagnosed with various names, such as xanthoma, xanthofibroma, xanthogranuloma, sclerosing hemangioma, histiocytoma and inflammatory pseudotumor. This tumor is originated from histiocyte and has occurred most commonly in skin, tendon, joint and soft tissue, but quite rarely has occurred in the lung. It has been reported about 40 cases in the world otherwise this case is probable for the first case in Korea. The authors here present a case of primary fibrous histiocytoma of the lung on September 1976. A 29-year-old Korean male was admitted to Han Yang University because of dyspnea and chest pain on right lower lung area. Chest X-ray revealed two large mass densities in right hilum and right lower lung field. A bilobectomy of upper and middle lobes of the right lung was performed which shows two well circumscribed masses measuring 4×2.5cm and 7×6cm in dimensions, respectively which was pale yellow in color and soft to friable consistency. Histopathologically, this tumor consists of histiocytes which is intermingled in the fibrous stroma with fibroblasts and fibrocytes arranged in a storiform pattern, and xanthomatous pattern of foam cells which is confirmed by the Masson trichrome, PAS, oil red O and reticulum stain.