颅内孤立性纤维瘤影像表现

Imaging Characters of Intracranial Solitary Fibrous Tumor

目的;探讨颅内孤立性纤维瘤的临床及影像学特征,以提高对该肿瘤的诊断率。材料与方法:回顾性分析3例经手术病理证实的颅内孤立性纤维瘤患者的CT和MRI表现。1例行CT平扫及增强,2例同时行CT和MRI平扫及增强。结果:3例颅内孤立性纤维瘤均为单发,肿块形态规则或不规则、边界清楚,发生于右枕叶1例,鞍旁2例,在CT上均呈稍高密度,增强扫描呈明显不均匀性强化,2例MRI表现为T1WI表现为等稍低信号,T2WI呈等、低混杂信号,MRI增强病灶实质部分显著强化,T2WI低信号区明显强化。结论:颅内孤立性纤维瘤MRI表现有一定特征性,MRT2WI低信号,增强明显强化较有特征,对诊断及鉴别诊断有重要价值。

Objective:To study clinical and radiological imaging features of intracranial solitary fibrous tumors(I-SFT) and to improve the diagnosis of it Methods:Clinical features and radiological findings of three patients with histological confirmed I-SFT were retrospectively analyzed and the related literatures were reviewed. One patient underwell conventional and enhanced CT scan and another two patients underwent conventional and enhanced MRI scan.Results: The lesions were located in parasellar( n = 2) and right occipital( n = 1) region. All the cases were single SFT, among which had clear boundary, with regular or irregular shape. The CT appearances of SFT were: slightly higher density on pre-contrast scan and obviously heterogeneous enhancement after-contrast. Compared with cerebral parenchyma, the tumors showed isointense or hypointense on T1WI. On T2WI, the tumors were mixed signal intensity, including low signal in all cases. On enhanced T1WI, the cases showed obviously heterogeneous enhancement. All the areas with low T2 signal intensity were strongly enhanced after gadolinium administration. Conclusion: MRI manifestation of I-SFT has some characteristics showing as heterogeneous signal intensity on T2WI and obvious enhancement of areas with low T2 signal intensity. It is helpful to the diagnosis and differential diagnosis of SFT.