软组织黏液样-圆形细胞脂肪肉瘤的MRI表现

MR Findings of Myxoid-Round Cell Liposarcoma

目的探讨软组织黏液样-圆形细胞脂肪肉瘤（MRCLS）的MRI表现及病理学基础。方法回顾性分析6例手术病理证实为软组织MRCLS患者的MRI资料。观察肿瘤的位置、大小、形态、边界、信号特点及强化方式。结果 4例位于下肢深部软组织间隙内,2例位于皮下,形态不规则,边界一般较清楚,瘤周水肿较轻,T1WI呈均匀或不均匀等信号或稍高、稍低信号,T2WI呈高信号,可见低信号分隔,增强扫描不同程度不均匀强化。结论软组织MRCLS的MRI表现有一定的特征性,仔细分析MRI征象有助于提高术前诊断的准确性。

Objective To observe the MR findings of myxoid-round cell liposarcoma and evaluate the relationship between MR findings and pathologic features. Methods MR findings of 6 myxoid-round cell liposarcoma confirmed pathologically were retrospectively reviewed,including location,size,morphology and signal intensity characteristics on T1WI,T2WI and the pattern of enhancement. Results 4 cases were located in the deep space among skeletal muscles of the lower extremities,2 cases were located in the subcutaneous,with irregular shape,sharp border and mild peritumoral edema.Tumors were homogeneous or heterogeneous iso-intense on T1WI and hyperintense on T2WI relative to the signal intensity of skeletal muscles and heterogeneous enhancement. Conclusion MRI may lead to a correct diagnosis of myxoid-round cell liposarcoma.