后颅窝血管母细胞瘤的MRI诊断

目的分析24例发生在后颅窝的血管母细胞瘤的MRI表现，探讨MRI对后颅窝血管母细胞瘤的诊断价值。方法对手术和病理证实的24例后颅窝母细胞瘤回顾性分析。男性15例，女性9例，年龄13岁～70岁。平均37．3岁。24例均行MRI平扫 增强检查。结果24例病灶，8例位于右侧小脑半球，6例位于左侧小脑半球，4例位于小脑隐部，3例位于四脑室，2例位于延髓背侧，1例同时累及两侧小脑半球。18例呈类圆形，6例呈圆形。MRI表现为囊性者18例，平扫T1Wl囊液呈低信号，T2WI及FLAIR呈高信号，壁结节T1WI为等信号，T2W1及FLAIR呈高信号。增强后囊腔不强化，壁结节明显强化。实性6例，平扫T1Wl肿瘤呈低信号，可见流空的血管影，T2W1及FLAIR呈高信号，增强后病灶明显强化。结论MRI检查是诊断后颅窝血管母细胞瘤的有效手段，具有非常重要的价值。

MRI diagnosis of posterior fossa hemangioblastomas

Objective: To investigate the value of MRI in the diagnosis of posterior fossa hemangioblastomas by analyzing their MRI appearances. Methods: Twnety-four cases of posterior fossa hemangioblastomas, confirmed surgically and pathologyically, were analyzed retrospectively.The age of 15 men and 9 women ranged from 13 to 70 years (mean 37.3 years). 24 patients underwent MRI examinations with and without intravenous injection of contrast media.Results: Total 24 posterior fossa hemangioblastomas were displayed on MRI: 8 tumors in right cerebellum,6 in left cerebellum,4 in vermis,3 in fourth ventricle,2 in medulla 1 in right and left cerebellum;18 tumors with oblong shape,6 with round shape.18 tumors appeared as cystic tumors with hypo-intense signal on T1WI but hyper-intense signal on T2WI and FLAIR, mural nodules with iso-intense signal on T1WI but hyper-intense signal on T2WI and FLAIR. No enhancement of cystic cavityor marked enhancement of mural nodules was revealed; 6 solid masses with hypo-intense signal on T1WI but hyper-intense signal on T2WI and FLAIR, and serpentine tumor vessels were found with marked enhancement on post-contrast scans.Conclusion: MRI is of great value as an effective method in the diagnosis of posterior fossa hemangioblastomas.