十二指肠平滑肌肉瘤临床极为罕见 ,且缺乏特异性表现。至今尚无有效诊断手段 ,早期误诊率高达 70 %～ 90 % ,临床认识经验少。本文结合一例临床病例 ,讨论诊治体会。1　临床资料患者男性 ,4 4岁。以发现上腹部渐增大包块半年 ,纳差 1月余为诉 ,于 2 0 0 0年 8月入院。患者半年 Duodenal leiomyosarcoma is extremely rare in clinical practice and lacks specific performance. So far there is no effective diagnostic method. The early misdiagnosis rate is as high as 70% to 90%, and there are few clinical recognition experiences. This article combines a clinical case to discuss the experience of diagnosis and treatment. 1 The clinical data were male, 4 4 years old. In order to find that the upper abdomen gradually enlarges the mass for six months, the appetite for more than one month is v., admitted to hospital in August 2000. Six months