In grade II, classic ependymomas, tumor cells have a regular, round to oval nucleus.

在典型的II级室管膜瘤中，肿瘤细胞的细胞核呈规则的圆形至椭圆形状。

Now, there are a few types of ependymomas and they're WHO graded I through III.

有几类室管膜瘤，按照世界卫生组织分级为I级至III级。

Now, again, they can form in the brain and spinal cord because that's where ependymal cells are found, but pediatric ependymomas tend to form in the fourth ventricle.

同样，它们可以在大脑和脊髓中形成，因为这些地方分布着室管膜细胞，但儿童室管膜瘤往往在第四脑室形成。

For example, as pinealomas, medulloblastomas, and ependymomas enlarge - the mass of the tumor can compress nearby ventricles blocking the flow of cerebrospinal fluid which causes swelling, called hydrocephalus.

例如，随着松果体瘤、髓母细胞瘤与室管膜瘤的增大，巨大的肿瘤可以压迫一旁的脑室，阻断脑脊液的流动，从而引起组织肿胀，称为脑水肿。