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目的:探讨小脑星形细胞瘤、髓母细胞瘤和血管母 细胞瘤的生物学特性与MRI特点.方法:收集术前行MRI检 查并经手术病理证实的51例小脑肿瘤.结合临床表现,观察 其发生部位、信号、结构和病理.结果:星形细胞瘤<15岁10 例(10/2);髓母细胞瘤<15岁9例,16～27岁7例;血管母细 胞瘤<15岁4例(4/19).67%的星形细胞瘤好发于小脑半 球;69%的髓母细胞瘤位于蚓部;血管母细胞瘤66%见于中线 半球旁;92%星形细胞瘤为囊性或囊实性.髓母细胞瘤儿童 多起自四脑室顶部髓帆生殖中心的胚胎残余细胞(8/2),成人 多源于小脑软膜下原始的外颗粒层细胞,以实性为主.血管母 细胞瘤源于原始血管形成中残余的胚胎细胞,70%为大囊小 结节;星形细胞瘤多为长T1,T2信号.髓母细胞瘤为混杂稍 长T1,T2信号,增强呈中度强化.血管母细胞瘤,增强时壁结 节明显强化.结论:小脑星形细胞瘤好发于半球,儿童多
Objective: To investigate the biological characteristics and MRI features of cerebellar astrocytoma, medulloblastoma and hemangioblastoma.Methods: Totally 51 cases of cerebellar neoplasms confirmed by surgery and pathology were collected before operation.Combined with the clinical manifestations, And its location, signal, structure and pathology.Results: Astrocytoma was less than 15 years old in 10 cases (10/2), medulloblastoma was less than 15 years in 9 cases, 16-27 years old in 7 cases, hemangioblastoma <15 (4/19) .67% of astrocytomas occurred in the cerebellar hemispheres, 69% of medulloblastomas located in the vermis, 66% of hemangioblastomas in the midline hemisphere, 92% of astrocytomas Cystic or cystic solid.Midoblastoma children from the top of the fourth ventricle sagittal reproductive center of embryonic residual cells (8/2), adult multi-derived from the outer layer of the primitive subependymal cells of the cerebellum in order to Hemangioblastoma originates from the remnants of primitive blood vessels Embryonic cells, 70% of large cystic nodules; mostly astrocytoma long T1, T2 signal medulloblastoma mixed for a slightly longer T1, T2 signal, enhanced moderately enhanced hemangioblastoma, enhanced Wall nodules significantly enhanced.Conclusion: Cerebellar astrocytoma occurs in the hemisphere, more children