儿童小脑的囊性星形胶质细胞瘤。绝大多数儿童脑肿瘤都发生在小脑幕下，这一点与成人相反。因此，儿童胶质瘤在颅后窝最常见。常是囊性的(所谓的青少年星形细胞瘤)。
Here is a cystic astrocytoma of the cerebellum in a child. Most childhood brain tumors arise below the tentorium, which is the reverse of the adult. Gliomas in children, therefore, are most common in the posterior fossa. They are often cystic (so-called "juvenile astrocytomas").