横纹肌肉瘤(rhabdomyosarcoma,RMS)是儿童软组织肉瘤中最常见的一种,成人少见。RMS主要发生在头颈部,发生于腹膜后者较罕见。其恶性程度高,发生于成人的RMS预后更差。尤其是腹膜后RMS早期无特异性症状,不易被发现,一旦出现症状已属中、晚期,治疗难度相当大。本文报道1例腹 Rhabdomyosarcoma (RMS) is the most common type of soft-tissue sarcoma in children, rare in adults. RMS occurs mainly in the head and neck, occurred in the retroperitoneal less common. Its high degree of malignancy, RMS occurred in adults with worse prognosis. In particular, RMS early retroperitoneal non-specific symptoms, not easy to be found, once the symptoms have been in the late stage, the treatment is quite difficult. This article reports 1 case of abdomen