Necrosis (in glioma)

What it is

Necrosis is an area of dead tumor tissue. In gliomas, it typically occurs when the tumor grows so rapidly that parts of it outgrow their blood supply and die. Necrosis is a feature of aggressive gliomas and one of the microscopic hallmarks used to define grade 4 tumors such as glioblastoma.

Understanding Necrosis (in glioma)

As an aggressive glioma grows quickly, some regions can become starved of oxygen and nutrients, leading to cell death — necrosis. Under the microscope, pathologists may see necrosis, sometimes with tumor cells lined up around the dead areas (called "pseudopalisading necrosis"), which is characteristic of glioblastoma. The presence of necrosis (along with microvascular proliferation) is one of the features that defines a glioma as grade 4. On imaging, necrosis can appear as a non-enhancing area within an enhancing tumor. Understanding necrosis clarifies a sign of aggressive, rapid tumor growth and one of the criteria for the most aggressive glioma grade. It reflects the tumor's biology rather than being a separate problem to treat. Understanding necrosis clarifies a hallmark of aggressive gliomas.

Why it matters

Understanding necrosis helps patients and families interpret a feature that signals aggressive, rapidly growing tumor — and that helps define the most aggressive glioma grade under the microscope.