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目的探讨下肢软组织黏液性-圆细胞型脂肪肉瘤的MR表现及其与病理组织学的联系。方法回顾性分析6例手术病理证实为下肢软组织黏液性或黏液性-圆细胞型脂肪肉瘤患者的MR表现,观察肿瘤的位置、大小、形态、边界、内部结构及在T1W I、T2W I、T2脂肪抑制像(SPIR)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,平均最大径约为15.2 cm,内部可见排列紊乱的纤维间隔,大部分纤维间隔厚度超过2 mm。T1W I肿块与周围骨骼肌相比呈均匀或不均匀等信号或略高、略低信号,T2W I呈高信号,脂肪抑制像肿块信号强度无减低,增强扫描见不同程度不均匀强化。结论MR可对下肢黏液性-圆细胞型脂肪肉瘤的诊断提供有价值的信息。
Objective To investigate the MR findings of mucinous-round cell liposarcoma in lower extremity and its relationship with histopathology. Methods The MR findings of 6 cases with pathologically confirmed mucinous or mucinous - type liposarcoma in the lower extremities were retrospectively analyzed. The location, size, shape, boundary and internal structure of the tumor were observed. Signal characteristics of fat suppression (SPIR) and intravenous injection of Gd-DTPA. Results The lumps were all located in deep muscle space of lower extremities with irregular shape and clear boundary. The average maximum diameter was about 15.2 cm. The disordered fibers were visible inside, and most of the fibers were thicker than 2 mm. The T1W I mass showed a uniform or non-uniform signal or slightly higher and slightly lower signal intensity compared with the surrounding skeletal muscle. The T2W I signal was high, the fat suppression mass signal intensity was not reduced, and the enhancement scan was unevenly intensified to varying degrees. Conclusion MR can provide valuable information for the diagnosis of mucinous-rounded liposarcoma in lower extremity.