原发性腹膜后肿瘤 (ｐｒｉｍａｒｙｒｅｔｒｏｐｅｒｉｔｏｎｅａｌｔｕｍｏｒ ,ＰＲＴ)是指原发于膈平面至骨盆入口处的非腹膜后器官的肿瘤。该病发病率较低 ,仅占全身肿瘤的 0 0 7%～0 2 0 % [1] ,占全身软组织肿瘤的 10 %～ 2 0 % ,高发年龄为5 0～ 6 0岁 ,约 6 0 %～ 85 Primary retroperitoneal tumor (PRT) is a non-retroperitoneal tumor originating from the plane of the diaphragm to the entrance of the pelvis. The incidence of the disease is low, accounting for only 0 0 7% ~ 0 0 0 0% of systemic tumors [1], accounting for 10% ~ 20% of systemic soft tissue tumors, high age at 50 ~ 60, about 60 % ~ 85