So let's start with tumor types that are generally infratentorial tumors, because they make up the majority of pediatric brain tumors.

我们从通常属于脑幕下肿瘤的类型开始介绍，因为它们是儿童脑肿瘤的主要类型。

Because astrocytes are found through the brain and spinal cord, astrocytomas can form throughout those locations, but juvenile pilocytic astrocytomas are mostly infratentorial tumors in the cerebellum or near the brainstem.

因为星形细胞遍布大脑和脊髓，星形细胞瘤也可以遍布在这些部位，但青少年毛细胞星形细胞瘤大多数是位于小脑内或脑干旁的脑幕下肿瘤。