软组织肿瘤是间充质来源的一大类异质性肿瘤，组织学成分复杂、种类繁多。多数为良性肿瘤，软组织肉瘤预后差，复发率高。目前常用的影像学评价方法包括：B超、PET-CT、X线平片、DSA、CT、MRI检查。其中，MRI是目前软组织肿瘤首选的影像学方法。结合MRI及上述影像学检查方法，能够充分显示肿瘤特征及病变侵犯周围组织的范围，对肿瘤进行定位、定性诊断，指导软组织肿瘤的分级、分期，有利于制定临床治疗计划乃至手术方案的选择，为临床有效治疗提供前瞻性的依据。

Roles of diagnostic imaging in the preoperative evaluation of soft tissue tumors        ZHOU Zheng-rong. Department of Diagnostic Radiology, Fudan University Shanghai Cancer Center; Department of Oncology, Shanghai Medical College, Fudan University, Shanghai 200032, China
Abstract    Soft tissue tumor originated from mesenchymal is a large class of heterogeneous tumor. Soft tissue tumors have complexity histology ingredients and diversity. Most soft tissue tumors are benign. Soft tissue sarcomas are rare. They have a poor prognosis and a high recurrence rate. Ultrasound, PET-CT, X-ray film, DSA, CT and MRI are commonly used as evaluation methods. MRI is the preferred imaging method of soft tissue tumors. Combining MRI and the methods mentioned above, tumor characteristics and invasion into surrounding tissues can be displayed completely. The location and type of mass can be made, and the grade and stage of tumor can be advised, which facilitate the program of clinical treatment and the choice of surgical scheme, and provide the basis of effective clinical treatment prospectively.