CT features of retroperitoneal primary liposarcoma

Objective To explore the CT features of primary retroperitoneal liposarcoma. Methods A retrospective analysis of pathologically confirmed primary retroperitoneal liposarcoma was done. Results Tumors were located in left retroperitoneal space in 16 cases, in right retroperitoneal space in 10 cases, and in median retroperitoneal space in 3 cases. The maximum diameter ranged from 9-40 cm, with an average of (17±8) cm. Tumors were round in 8 cases, oval in 10 cases and irregular in 11 cases. The boundary of tumor was clear in 10 cases. CT plain scanning was mixed density in 20 cases, uniform density in 9 cases; Tumors of necrotic cysts in 11 cases, and with calcification in 9 cases; Enlarged intraperitoneal and retroperitoneal lymph nodes were found in 6 cases and intrahepatic metastases in 3 cases. The solid part was mild to moderate enhancement. Pathologically of the 29 cases, 7 were dedifferentiated, 4 were mucous, 5 were polymorphic, 11 were well differentiated and 2 were mixed. Conclusion The CT examination of primary retroperitoneal liposarcoma is of great value in locating tumor and judging the relationship between tumor and adjacent organs. Key words: Liposarcoma; Retroperitoneal neoplasms; Tomography, X-ray computed