颅脑血管外皮细胞瘤的CT、MRI与病理对照研究

目的：探讨颅脑血管外皮细胞瘤的临床、病理和ＣＴ、ＭＲＩ特征。材料与方法：收集经ＣＴ和ＭＲＩ诊断为脑膜瘤,经手术病理证实为血管外皮细胞瘤１２例,年龄３４￣５８岁。ＣＴ检查７例,均采用增强前、后常规扫描。ＭＲＩ检查１２例,采用ＳＥ序列增强前、后扫描。结果：１２例肿瘤全部发生在颅内脑外,７例ＣＴ平扫呈低等混合密度２例,呈等高混合密度５例;增强后扫描呈不均匀强化６例,均匀强化１例。骨窗显示病灶局部侵蚀性骨质破坏４例。ＭＲＩ平扫,Ｔ１ＷＩ呈等高不均匀信号１０例,呈等信号２例;Ｔ２ＷＩ呈不均匀等高信号１０例,呈等信号２例。１２例中７例显示脑膜尾征;增强后扫描１ 均呈不均匀强化。结论：血管外皮细胞瘤具有一定的ＣＴ、ＭＲＩ特征性表现：分叶状、丰富的血管流空、肿瘤内密度或信号不均匀、无肿瘤内钙化和骨质增生、局部颅骨呈溶骨性破坏。

Comparing CT and MRI Features with Pathology in Intracranial Hemangiopericytomas

Purpose: To analyse clinical. pathologic. CT and MRI features of intracranial hemangiopericytomas. Materials and Methods: 12 cases of intracranial hemangiopericytomas were proved by patholo- gy. Age ranged from 34 to 58 years. CT were performed in 7 Patients before and after intravenous contrast medium. MRI with and without contrast medium was available for 12 patients. Results: All patients were extraaxial tumors. Of 7 unenhanced CT scans, 5 hemangiopericytomas appeared as heterogeneously hyperdense tumors with focal areas of isodense. The other 2 tumors were hypo - isodense. of a total 7 contrast - enhanced CT scans, 6 hemangiopericytomas had heterogeneous enhancement; the other 1 had ho- mogeneous enhancement. Bone erosion was present in 4 of 7 hemangiopericytomas imaged with CT. None had hyperostosis or tumor calcificatins. On T1 - weighted MR images, 10 of 12 tumors were hyper- isosignal intensity with conical gray matter; the other 2 had isointense with cortical gray matter; On T2 - weighted images, 10 of 12 were heterogeneously iso - hyper signal intensity. The other 2 were isointense. All 12 tumors imged with contrast - enhanced T1 - weighted MR imaging showed hetero- geneously enhancement. 7 of the 12 had a "dural tail" sign. Conclusion: Intracranial Hemangiopericytomas has special CT and MRI features: multilobulated, rich in vascular voild flow in the tumor, hetero- geneous density or signal intensity on CT or MRI, hyperostosis and intratumoral calcification are not present, the tumor hat bone erosion.