滑膜肉瘤CT及MRI特征

CT and MRI features of synovial sarcoma

目的探讨滑膜肉瘤CT及MRI特征。方法回顾性分析18例经手术病理证实的滑膜肉瘤患者的CT(16例)和MRI(10例)特征。结果 14例邻近关节,4例远离关节。18例中,8例发生转移。CT表现:16例肿瘤边界均清晰,其中2例(2/16,12.50%)见瘤周水肿;9例(9/16,56.25%)密度均匀,7例(7/16,43.75%)密度不均,肿瘤实性成分呈等或稍低密度;6例(6/16,37.50%)肿瘤内见钙化;3例(3/3,100%)增强扫描肿瘤轻度强化。MRI:10例肿瘤边界均清晰、见瘤周水肿;8例(8/10,80.00%)T1WI呈等信号,2例(2/10,20.00%)等信号内散在稍高信号;10例(10/10,100%)T2WI均呈高低混杂信号,7例(7/10,70.00%)见"三信号征";9例(9/10,90.00%)见线状低信号分隔。结论滑膜肉瘤CT和MRI表现具有一定特征性,有助于术前诊断。

Objective To explore the CT and MRI features of synovial sarcoma. Methods CT （n = 16） and MRI （n = 10） features of 18 patients with pathologically proven synovial sarcoma were retrospectively analyzed. Results There were 14 cases located adjacent to the joints, and 4 cases located far away from the joints. The metastases occurred in 8 cases. CT scanning： Sixteen tumors all had clear boundary, with tumor edema in 2 cases （2/16, 12.50 %）. The tumor was homogeneous in 9 cases （9/16, 56.25%） and heterogeneous in 7 cases （7/16, 43.75%）, and the solid content of the tumor dis-played equal or slightly low density. Six cases （6/16, 37.50%） showed calcification in the tumor. Slight enhancement of the tumor was seen in all the 3 cases （3/3, 100 %） in CT enhancement scanning. MRI.. All the 10 cases had clear boundary with tumor edema. On T1WI, 8 （8/10, 80.00 %） showed homogenous isointensity and 2 （2/10, 20.00 %） showed slightly high signal interspersing in the homogenous isointensity. On T2WI, heterogeneous signal was observed in all the 10 cases, 7 （7/10, 70.00%） of them showed ＂triple sign＂ and 9 （9/10, 90. 00%） of them showed hypointense linear septa. Conclusion There are some characteristic findings in CT and MRI for synovial sarcoma, which is helpful for preoperation dignosis.