生前暴露与高或低级别星型细胞瘤、室管膜细胞瘤、生殖细胞瘤或是其他少见的尚未明确分类的肿瘤的发病风险没有关系。
Prenatal exposure was not associated with risk of high - or low-grade astrocytoma, ependymoma, germ cell tumor, or other rare or incompletely specified tumors.
它由星形细胞瘤，少突胶质细胞瘤，室管膜瘤发展而来，它们是由神经外胚层细胞诱导的。
It developed from astrocytoma, oligodendroglioma, ependymoma, which were induced by neural ectoblast.
结果四脑室肿瘤以髓母细胞瘤、室管膜瘤和星形胶质瘤多见，肿瘤与发病年龄关系密切。
Results the most common neoplasms were medulloblastoma and ependymoma and astrocytoma in the fourth ventricular. Some tumors had specific patients age.
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