Masamitsu K]DO], Kazuyoshi KUWANOi, Akira KiYIKIi and Akio HORIE7 'Diz/ision ofRespt'ratorv Disease, Scheot of'thdicine, bbeiverrity ofOc'ccipationat and Envirenmental Hbalth, Japan, Kitadyushu 807, Yopan 2Dopartment ofPathotogy' and Oncology, School qf iWkdicine, University of' Occapational and Em,irenmentat Hbalth, ,lcipan. Kitalvushu 807, Yopan Athstract : Kep, avords: Malignant fibrous histiocytema (MFH) can be classified as a pleomorphic mesenchymal sarcoma which occurs most cornmonly ln

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... e extretnities arid retreperiteneum. L'Ve rcport a very rare case of NEFH presumably originating in the pulmonary artery and rcsembling recurrent pulmonary thromboembolism, MFH was suggested by transbronchial biopsy and confirrned by open lung biopsy. Obstruction of the righL main pulmonary artery and stenosis of the left main pulmonary arter>, was confirmcd by pulmonary angiography, malignant fibrous histioc>'toma, pulmonary thrombocmbolism, pu]monary artery sarcoma.