横纹肌肉瘤(rhabdomyosarcoma,RMS)为常见的软组织肿瘤之一,发病率为416/百万人口/年,男女比例为1.3:1.0,40岁以上发病者罕见,是儿童较常见的恶性肿瘤之一,也是0岁~20岁儿童及青少年期软组织肉瘤中最常见的类型,约占总发病率的50%~([1])。RMS骨髓浸润极少发生,国内文献报道迄今为止只有6例~([2-7]),现报道我院近期收治的1 Rhabdomyosarcoma (RMS) is one of the common soft tissue tumors with a prevalence of 416 / million population / year, with a male to female ratio of 1.3: 1.0. Risks are rare in patients over 40 years of age and are one of the more common malignancies in children. It is also the most common type of soft tissue sarcoma in children and adolescents aged 0 to 20 years, accounting for about 50% of the total incidence [1]. RMS minimal infiltration of bone marrow, the domestic literature reported so far only 6 ~ ([2-7]), is now reported in our hospital recently treated 1