膈肌肿瘤极为少见,原发膈肌肿瘤常与膈疝、局限性膈膨出,起源于肺底的肿瘤相混淆,本文报道1例经证实的左侧膈肌原发肿瘤。病例　男性,52岁,Ｘ线检查发现左侧心膈角肿物有4ｃｍ×4ｃｍ大小,椭圆形,正位肿物与心影重叠,侧位肿物位于膈肌上、下几乎各占一半,上半部与膈肌阴影融合, Diaphragm tumors are extremely rare, primary iliac muscle tumors are often associated with hernias, confined hernias, and tumors originating from the bottom of the lungs are confused. This article reports one case of a confirmed primary tumor of the left iliac crest. Case male, 52 years old, X-ray examination showed that the left palpable mass was 4cm x 4cm in size, oval, positive tumor overlap with the heart shadow, lateral mass in the diaphragm is almost half of the upper and lower, on The half is blended with the shadow of the diaphragm.