桥小脑角区少见病变的MRI表现和病理对照研究

目的探讨桥小脑角区少见病变的MRI表现,提高MRI对该区域少见病变的诊断准确性。资料与方法回顾性分析26例经病理证实的桥小脑角区少见病变的MRI表现并和病理作对照分析。结果 26例病变中,脉络丛乳头状瘤5例,原始神经外胚叶肿瘤(PNET)4例,海绵状血管瘤、血管外皮瘤、动脉瘤各3例,转移瘤4例,内淋巴囊瘤2例,皮样囊肿、骨孤立性浆细胞瘤各1例。右侧桥小脑角区16例,左侧10例;位于桥小脑角池9例,起自脑内或脑室累计桥小脑角11例,起自脑外颅底6例。脉络丛乳头状瘤可原发于桥小脑角或由第四脑室侵入,多表现为菜花状,中度或明显强化;皮样囊肿在扩散加权成像(DWI)上呈高信号,无强化;动脉瘤瘤体呈流空信号或周边环形流空信号,与邻近血管一致的强化;PNET以实性为主,DWI呈高信号,中度到明显强化;海绵状血管瘤在T1WI、T2WI上均呈混杂信号,瘤周见低信号环;血管外皮细胞瘤呈分叶状并与硬膜窄基底相连,瘤内常见坏死和流空血管,增强后明显强化;内淋巴囊瘤和髓外浆细胞瘤均表现肿块伴颅底骨质破坏,前者信号混杂,后者信号较均匀;转移瘤多有原发恶性肿瘤史,单发或多发,可位于脑内,也可位于脑外,MRI表现缺乏特征性。和手术及病理对...

MRI Findings of Rare Lesions in the Cerebellopontine Angle:Comparison with Pathological Results

Objective To investigate the MRI features of rare lesions in the cerebellopontine angle(CPA),so as to improve the diagnostic accuracy.Materials and Methods The MRI manifestations of 26 rare lesions in CPA confirmed by pathology were analyzed retrospectively.Results The rare lesions in CPA included choroid plexus papilloma in 5 cases,primitive neuroectodermal tumors(PNET) in 4 cases,cavernous hemangioma,hemangiopericytoma and aneurysm in 3 cases each,metastatic tumor in 4 cases,endolymphatic sac tumor in 2 c...