Skull Base Tumors

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An astrocytoma is a glioma that develops from star-shaped glial cells (astrocytes) that support nerve cells.

Grade I: These are usually benign tumors.

Grade II: Also known as low-grade or diffused astrocytoma, invade surrounding tissue and grow at a relatively slow pace.

Grade III: An anaplastic astrocytoma is classified as a grade III tumor. This tumor type grows faster and more aggressively than lower grade astrocytomas. This is an invasive tumor type that will often infiltrate neighboring brain tissue.

Grade IV: Glioblastoma (previously known as GBM) is the most common and deadliest of malignant primary brain tumors in adults. It develops primarily in the cerebral hemispheres but can develop in other parts of the brain, brainstem, or spinal cord.