中枢神经系统孤立性纤维瘤的MRI特征及鉴别诊断

目的探讨中枢神经系统孤立性纤维瘤(SFT)MRI表现特征,提高对该病的正确诊断及鉴别诊断水平。方法收集8例经手术病理证实的SFT,其中6例为颅内SFT、2例为椎管内SFT,分析其部位、形态大小、信号特点及邻近脑膜和骨质改变等。结果 6例颅内SFT位于幕上,2例椎管内SFT位于颈段和胸段的硬膜下。肿瘤在T1WI多呈等或稍低信号,T2WI多呈稍高信号,内可见短T2信号和流空血管影,所有病灶增强扫描后均呈明显强化。1例颅内STF可见"脑膜尾征",2例椎管内SFT未见"脊膜尾征",2例颅内SFT邻近骨质受压变薄。6例颅内SFT在DWI上分别呈稍低信号、等信号和稍高信号。结论 MRI对中枢神经系统SFT的诊断及鉴别诊断具有一定的价值。

MRI Features and Differential Diagnosis of Solitary Fibrous Tumor in the Central Nervous System

Objective To explore the MRI features of solitary fibrous tumor(SFT) in the central nervous system and to improve the level of diagnosis and differential diagnosis. Methods A total of 6 patients of intracranial SFT and 2 patients of intraspinal SFT which confirmed by surgery and pathology were analyzed retrospectively, including the location, shape, size, signal characteristics and adjacent meninges and the bone changes around the lesion. Results There were 6 cases of intracranial SFT located in the supratentorial area and 2 cases of intraspinal SFT were located in the intradural spinal canal at cervical and thoracic level. The tumors mostly demonstrated as iso-or slightly hypointensity on T1 WI and isoor slightly hyperintensity on T2 WI. There were short signal intensity and signal void of vessels within the tumors. All the lesions were obviously enhanced on contrast-enhanced MRI. One case of intracranial SPT was found "dural sign" and 2 cases of intraspinal SFT without "dural sign". The adjacent bone of 2 cases of intracranial SPT were found compressed and became thin. The intracranial SPT demonstrateded slightly hypointensity, iso-intensity and slightly hyperintensity on DWI. Conclusion MRI has a certain value in the diagnosis and differential diagnosis of solitary fibrous tumor in the central nervous system.