髓外浆细胞瘤 (EMP)是原发于骨髓之外的一种以浆细胞异常增生、浸润相应组织器官为特征的恶性肿瘤 ,临床上较为少见。此病通常局限于头颈部 ,对放疗敏感。用 40 0 0～ 5 0 0 0 c Gy的剂量作体外照射 ,大约 70 %的软组织浆细胞瘤患者能被治愈 ,预后较一般骨髓瘤好 ,生存期长[1 , Extramedullary plasmacytoma (EMP) is a malignant tumor characterized by abnormal plasma cell proliferation and infiltration of the corresponding tissues and organs outside of the bone marrow, which is rare in clinic. The disease is usually confined to the head and neck, sensitive to radiotherapy. Approximately 70% of patients with soft tissue plasmacytoma can be cured with an in vitro dose of 40 0 ​​0 ~ 50 000 c Gy, the prognosis is better than that of the usual myeloma, and the survival time is longer [1,