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目的提高对非典型部位髓母细胞瘤的认识。资料与方法回顾性分析11例经手术病理证实的位于非小脑蚓部髓母细胞瘤的MRI表现。结果 11例髓母细胞瘤中,9例位于小脑半球(左侧4例,右侧5例),1例位于左侧桥小脑角区,1例位于左侧桥臂。7例肿瘤内见囊变坏死区。MRI信号特征和典型部位的髓母细胞瘤相似,T1WI呈低或稍低信号,T2WI呈高或稍高信号,增强后呈不同程度强化。11例均引起第四脑室不同程度受压、移位;6例出现不同程度脑积水;8例瘤周出现轻重不等的水肿。结论非小脑蚓部髓母细胞瘤多位于小脑半球。仔细分析其MRI特征有助于术前正确诊断。
Objective To improve the understanding of atypical medulloblastoma. Materials and Methods Retrospective analysis of MRI findings of 11 cases of non-cerebellar medulloblastoma confirmed by surgery and pathology. Results Among 11 cases of medulloblastoma, 9 cases were located in the cerebellum hemisphere (4 cases on the left and 5 cases on the right). One case was located in the left cerebellopontine angle region and the other was located in the left lateral arm. 7 cases of tumor see cystic necrosis area. MRI signal characteristics and typical parts of medulloblastoma similar, T1WI was low or slightly lower signal, T2WI was high or slightly higher signal, enhanced enhanced to varying degrees. Eleven cases were caused by the fourth ventricle to varying degrees of compression, displacement; 6 cases of varying degrees of hydrocephalus; 8 cases of varying degrees of tumor around the circumference of the edema. Conclusion Non-cerebellar medulloblastoma mostly located in the cerebellar hemisphere. Careful analysis of its MRI features can help in the correct diagnosis before surgery.