纵隔平滑肌肉瘤极为罕见,国内文献仅见2例。我院经手术病理证实1例,报告如下: 男,46岁。住院号:103052。3年前劳累后出现左前胸隐痛,近半年进行性加重,呈胀痛和窜痛,涉及左肩左背部,有时影响睡眠。无咳嗽、咳痰、咯血、气短。饮食正常。来诊前外院透视发现左胸上部有肿块。平素体健,数年 The septal leiomyosarcoma is extremely rare and only two cases are seen in domestic literature. One case was confirmed by surgery and pathology in our hospital. The report is as follows: Male, 46 years old. Hospital No.: 103052. After 3 years ago, there was pain in the left anterior thoracic cavity after the exertion. He had aggravated in the past half year. He presented with pain and pain, involving the left shoulder and left back, and sometimes affected sleep. No cough, sputum, hemoptysis, shortness of breath. The diet is normal. In the external hospital before the visit, a lump was seen in the upper left chest. Physically healthy for several years