良性间叶瘤是由分化好而成熟的多种间胚叶成分构成,又称错构瘤,多见于肝、肾肺、脑等部位,而生长在肢体软组织内较为少见。本文报告1例。患者女,31岁,因左大腿前中段肿块15年,行走时疼痛,于1984年4月9日入院。否认左大腿有外伤,感染史。查,左大腿前 Benign mesenchymal tumor is composed of a variety of well-differentiated and mature mesodermal components, also known as hamartoma, more common in the liver, kidney, lung, brain and other parts of the body, but growing in the soft tissue of the limb is relatively rare. This article reports 1 case. The patient, 31 years old, was admitted to the hospital on April 9, 1984 because of a 15 year old mass in the left middle thigh and pain during walking. Denied the left thigh for trauma and history of infection. Check before the left thigh