眼眶孤立性纤维瘤的MRI表现

目的：探讨MRI诊断眼眶孤立性纤维瘤的价值。方法：回顾性分析5例经病理证实的孤立性纤维瘤,5例均作眼眶MRI扫描,对其MRI表现进行研究分析。结果：5例眼眶孤立性纤维瘤为单发、边界清楚肿块,大小1.6-3.8 cm。发生于泪腺1例,肌锥内间隙2例,肌锥外间隙2例。平扫T1WI肿瘤呈等、稍低信号,T2WI信号不均匀,2例呈等、稍低信号,2例呈等、稍高信号,1例呈高信号。增强扫描4例呈明显较均匀强化,1例呈轻度至中度强化。结论：眼眶孤立性纤维瘤MRI表现具有一定特征性,明确诊断需结合免疫组织化学分析。

Solitary fibrous tumor of the orbit: MRI findings

Objective：To study the MRI features of solitary fibrous tumor of the orbit and the diagnostic value of MRI.Methods：Conventional MRI was performed in 5 patients with solitary fibrous tumor of the orbit proven surgically and immunohistochemically.Results：All of the tumors were found as a solitary,well-defined mass,ranging in size from 16 to 38mm（mean,26 mm） on MRI.Two tumors were located in the extraconal spaces of the orbit,2 in the intraconal spaces of the orbit,and 1 in the lacrimal gland.On unenhanced MRI,5 lesions presented hypo-or isointensity on T1WI,but on T2WI 2 lesions showed hypo-or isointensity,3 appeared hyper-or isointense and 1 appeared hyperintense.On contrast enhanced MRI,4 cases showed intensive enhancement,1 case showed mild and moderate enhancement.Conclusion：MRI can reveal the characteristic findings of solitary fibrous tumor of the orbit.The accurate diagnosis needs to combine immunohistochemical analysis.