腹膜后原发性腺泡型横纹肌肉瘤少见 ,其定性诊断较为困难 ,现将本院确诊的 1例报告如下。病例报告患者女 ,2 7岁。上腹部不适半年 ,食后反胃 2个月 ,自觉上腹部包块 2天。查体 :剑突左下方可触及 8ｃｍ× 12ｃｍ大小的包块 ,质硬、表面光滑、无压痛、活动度差。实验室检查无特 Retroperitoneal primary alveolar rhabdomyosarcoma is rare and its qualitative diagnosis is more difficult. One case diagnosed in this hospital is now reported as follows. Case report female patient, 2 7 years old. The upper abdominal discomfort lasts for six months. After eating for 2 months, the abdominal mass is consciously congested for 2 days. Physical examination: The xiphoid can touch the mass of 8cm×12cm in the lower left. It has a hard surface, a smooth surface, no tenderness, and poor activity. No special laboratory tests