Abstract: Objective: To evenluate the role of CT, MRI and DSA in assessment of the extent and severity of the invaded vessels related to a soft tissue sarcoma(STS), in order to provide available informations for operation planning. Methods : Radiographic (in 4 cases), CT (in 4 cases), MRI (3cases) and DSA (in 1 case) findings obtained preoperatively in 4 STS patients verified on operation were analysed. After operation, the local circulation was evaluated with Doppler (in 4 cases), CT and USG (3 cases). Results : CT, MRI and DSA demonstrated that 8 major vessels were invated by the sarcoma. Of them, one was very close to the tumor; 2 were adhered to the tumor, and 5 were mingled with the tumor. Seven vessels were operated upon including artery sheath resection 7, all vessels resection with GORE-TEX prosthesis transplant (in 5 cases). The surgical margins was histologically normal in 7 cases. The rate of surgical intervention was 87.5Y in cases with invaded vessels demonstrated by CT, MRI and DSA. Conclusions : CT, MRI and DSA are valuable in assessment of the extent and severity of invaded vessels related to a soft tissue sarcoma(STS), thus providing useful information for operation planning.