肺原发恶性纤维组织细胞瘤（PPMFH）比较少见，本院发现4例报告如下。例1男，31岁。主因咳嗽，1976年胸片于右肺发现一四块状阴影10cmｘ8cm。1987年7月咳嗽、胸痛和气短明显加重。胸片显示自右肺第一前助以下为大片状致密阴影，8月24日行开胸探查术。病理检查：右肺中叶肿物大 Primary lung malignant fibrous histiocytoma (PPMFH) is rare, and 4 cases were reported in this hospital as follows. Example 1 Male, 31 years old. Mainly due to cough, in 1976 chest X-ray in the right lung found a block of shadow 10cmx8cm. In July 1987, cough, chest pain, and shortness of breath significantly increased. The chest radiograph showed that the first aid from the right lung was followed by a large dense shadow, and on August 24th, a thoracotomy was performed. Pathological examination: large right lung mass