平滑肌肉瘤多见于 40岁以上成年女性 ,下肢、腹膜后为好发部位 ,上肢、躯干、头颈等处及大的静脉均可发生 ,而口腔很少见 ,现将我科诊治的 1例报道如下。　　　患者 ,女 ,80岁。以舌背部突出性肿物两年余来我科就诊 ,门诊以“舌后部肿物待查” ,于 1997年 5月 5日收入院治疗。 Leiomyosarcoma more common in adults over the age of 40, lower extremities, retroperitoneal as a good site, upper limbs, torso, head and neck and other venous and large venous can occur, and the mouth is rare, now our clinic treatment of a reported as follows . Patient, female, 80 years old. In order to highlight the back of the tongue tumor more than two years to our department, clinic to “tongue after the tumor to be investigated,” on May 5, 1997 income hospital treatment.