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、髓母细胞与室管膜的增大，巨大的肿以压迫一旁的脑室，阻断脑脊液的流动，从而引起组织肿胀，脑水肿。

Now, while medulloblastoma may be the most common malignant tumor, the most common primary pediatric tumor is a type of astrocytoma called a juvenile pilocytic astrocytoma.

尽管髓母细胞是最常见的恶性肿，最常见的童原发脑肿是一种星形细胞，青少年毛细胞型星形细胞。

Because of this, medulloblastomas are typically only classified as grade IV.

因这一特征，髓母细胞通常只被分IV级。

Histologically, medulloblastomas often have a feature called Homer-Wright rosettes, which are dense tangles of neurons and neuroglial cells, surrounded by ring-like structures formed by tumors cells.

组织学方面，髓母细胞常具有一种特征，Homer-Wright菊形团：即肿细胞核围绕着密集缠结在一起的神经细胞和神经胶质细胞突起排列。

Medulloblastomas originate from embryonic stem cells and they tend to be extremely aggressive.

髓母细胞来源于胚胎干细胞，它们往往极具侵袭性。

Overall, the most common malignant tumor is a medulloblastoma, which typically forms in or around the cerebellum, adjacent to the fourth ventricle.

总体而言，最常见的童恶性脑肿是髓母细胞；它们通常在第四脑室旁的小脑内或周围形成。

These patients had a lot more non-T cell stuff, specifically myeloid cells, you know, the immune system's first responders, but they can also be really suppressive in cancer settings.

这些患者体内有更多非T细胞成分，特别是髓系细胞——免疫系统的第一道防线，但在癌症环境中它们也具有很强的抑制作用。

They started with the more common myeloid cells, monocytes, macrophages, neutrophils.

他们首先研究了较常见的髓系细胞，包括单核细胞、巨噬细胞和中性粒细胞。

But the TME gets dominated by immunosuppressive cell types, particularly myeloid cells and stromal cells.

但肿微环境（TME）被免疫抑制性细胞类型主导，尤其是髓系细胞和基质细胞。