下肢软组织粘液性脂肪肉瘤的MRI表现

MR Findings of Myxoid Liposarcoma of the Lower Extrem ities

目的:探讨下肢软组织粘液性脂肪肉瘤的MR表现。方法:回顾性分析6例手术病理证实为下肢软组织粘液性或粘液性-圆细胞型脂肪肉瘤患者的MR表现,观察肿块的位置、大小、形态、边界、内部结构及在T1WI、T2WI、T2脂肪抑制序列和静脉注射Gd-DTPA后信号特点。结果:肿块均位于下肢深部肌肉间隙内,形态多不规整,边界清楚。T1WI肿块与周围肌肉相比呈均匀或不均匀等信号或略低信号,T2WI呈高信号,脂肪抑制像肿块信号强度无减低,增强扫描不同程度不均匀强化。结论:MR可对下肢粘液性脂肪肉瘤的诊断提供有价值的信息。

Objective：To observe the MR findings of myxoid liposarcoma of the extrem ities. Methods：MR findins of 6 myxoil liposarcoma of the extrem ities confimed pathologically were retropectively reviewed,including tumor＇s location,size,morphology,intemal architecture and signal intensity characteristics on T1WI,T2WI and SPIR T2WI and the pattern of enhancenment. Results：All tumors were located in the deep space among skeletalmuscles of the lower extrem ities,with unregular shape,sharp borber and thick septal structures.Tumors were homogeneous or heterogeneous isointense on T1WI and hyperintense on T2WI relative to signal intensity of skeletamuscles and heterogeneous enhancement after the injection of Gd-DTPA. Conclusion：Conclusion：MRI may lead to a correct diagnosis of Myxoid Liposarcoma of the Lower Extrem ities.