目的 分析颅内血管周细胞瘤的MRI特征,提高该病术前诊断正确率。方法 回顾性分析21例经手术病理及免疫组织化学检查证实的颅内血管周细胞瘤患者的MRI表现及临床资料,总结其MRI特征。结果 幕上16例,幕下5例;15例病灶呈分叶状,6例呈类圆形;20例边界清晰,病灶周围脑组织受压呈现“皮质塌陷征”;13例瘤周未见水肿或轻度水肿,8例出现瘤周中度水肿;18例与临近硬脑膜呈窄基底相连,3例与临近硬脑膜呈宽基底相连;2例有骨质破坏。MRI检查:T₁WI、T₂WI均呈等或稍高信号为主,15例病灶内见坏死囊变;17例病灶内见血管流空信号;21例病灶内均未见钙化;增强扫描6例呈均匀明显强化,15例呈不均匀明显强化,坏死、囊变区未见强化,3例出现“脑膜尾征”。结论 颅内血管周细胞瘤MRI表现具有一定特征,这对提高该病术前诊断正确率具有重要意义。

Objective To study the MRI features of intracranial hemangiopericytoma and improve the diagnostic accuracy of the disease. Methods We reviewed the MRI findings and clinical data of 21 cases of intracranial hemangiopericytoma confirmed by operation pathology and immunohistochemistry, and analyzed the MRI features. Results The cytomas were above the tentorium in 16 cases, while under the tentorium in 5 cases, were lobulated in 15 cases, while were round spots in 6 cases.20 cases showed well-defined margin, adjacent brain tissue was compressed and showed cortical collapse. There was no or mild peritumoral edema in 13 cases, while moderate peritumoral edema was found in 8 cases.In 18 cases they connected to the narrow base of dura, others connected to the broad base of dura.The adjacent bones were destroyed in 2 cases. MRI and T1WI and T2WI showed equal or slightly higher signs. Necrotic cysts were found in 15 cases. Vascular flow void signs were found in 17 cases. None of the lesions had calcification. Homogeneous and obvious enhancement was seen in 6 cases and heterogeneous enhancement in others for enhancement scanning, while there was no enhancement in necrotic cysts and dural tail sign was seen in 3 cases. Conclusions The MRI of intracranial hemangiopericytoma is specific,which is important for improving the diagnostic accuracy of the disease.