胸膜以外部位孤立性纤维瘤的CT和MRI影像分析

CT and MRI findings of extrapleural solitary fibrous tumor

目的:探讨胸膜以外部位孤立性纤维瘤(ESFT)的CT和MRI表现及病理学特征,提高对本病的认识及诊断水平。方法:回顾性分析7例ESFT的CT和MRI表现及病理学表现。结果:本组ESFT的主要CT表现为略低密度软组织肿块。主要MRI表现为T1WI上肿瘤呈低信号～稍高信号,T2WI上呈等信号或稍高信号。增强扫描示早期肿瘤实质轻度～明显强化,后期达强化高峰,呈"快进慢出"型强化。病理学检查提示肿瘤均由梭形细胞构成,免疫组化染色CD34阳性。结论:ESFT的CT和MRI表现呈多样化,多期动态增强扫描可提高诊断准确性。

Objective：To explore the CT and MR findings of extrapleural solitary fibrous tumor（ESFT） with its pathological features and improve the diagnosis of the ESFT.Methods：Seven cases of ESFTs were studied by CT,MRI examination compared with the histopathological and immunohistochemcal techniques.Results：A solitray soft tissue mass with slight low density was detected by CT as a major finding.On MR T1WI,the tumors showed slightly low、isointense signal or slight hyperintensity;the tumors showed slight hyperintensity on T2WI.Contrast-enhanced CT or MRI showed early intense enhancement and late amounted to peak.Microscopically,ESFT was composed of spindle cells with various patterns and these spindle cells were CD34 positive on immunohistochemistry.Condusion：ESFT shows variable appearances on CT and MRI according to tumor cells distribution and myxoid degeneration or hemorrhage within the tumor and dynamic multiphase contrast-enhanced scanning can improve the diagnostic accuracy.