腱鞘巨细胞瘤的MRI表现

目的探讨腱鞘巨细胞瘤(GCTTS)的MRI表现特点。方法收集2008年12月-2010年8月9例经手术病理组织证实的GCTTS患者MRI影像进行回顾性分析。所有患者均行MRI平扫,2例行增强扫描。结果 9例GCTTS患者中,病变位于膝关节6例,踝关节1例,腕关节1例,足背1例;4例局限型,5例弥漫型。T1加权像6例与骨骼肌信号相近,1例稍高于骨骼肌,2例相对于骨骼肌呈等低信号;T2加权像5例稍高于骨骼肌信号,2例相对于骨骼肌呈等高混杂信号,2例呈高低混杂信号;2例增强后病灶明显不均匀强化;关节积液2例,骨质受侵犯2例。结论 MRI对GCTTS有特征性表现,并敏感显示关节内外组织结构的侵犯程度及范围,MRI是诊断GCTTS的理想检查方法。

MRI Manifestations of Giant Cell Tumor of Tendon Sheath

Objective To evaluate the MRI manifestations of giant cell tumor of tendon sheath(GCTTS).Methods Routine MR images of 9 patients with surgery and pathology proved GCTTS dating from December 2008 to August 2010 were retrospectively reviewed.T1 and T2 weighted imaging were carried out in all of the 9 patients.Two patients had enhanced MRI.Results Among the 9 cases of GCTTS,6 were located in the knee joint,1 in the ankle joint,1 in the wrist joint,and 1 in the foot.There were 5 cases of diffusion form,and 4 of focal.The signal intensities of GCTTSs were iso-intense(n=6) and slightly hyperintense(n=1) and heterogeneously iso-/hypointense(n=2),compared with those of skeletal muscle on T1WI: Compared with those of skeletal muscle on T2WI,the signal was slightly hyperintense(n=5) and heterogeneously iso-/hyper intense(n=2) and heterogeneously hyper/hypo-intense(n=2).The signal intensities tended to be markedly heterogeneously enhanced(n=2) following Gd-DTPA administration.The joint effusion was presented in 2 cases.The bone erosion showed in 2 cases.Conclusions Characteristic manifestations of GCTTS can be shown on MRI.The extent as well as the degree of intra-and extra-articular invasion can also be revealed.MRI is an ideal modality for the diagnosis of GCTTS.