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Astrocytoma

Astrocytomas are intracranial tumors derived from astrocytes. They can have narrow or diffuse zones of infiltration.

WHO Grading System for Astrocytomas

  • WHO Grade 1 — pilocytic astrocytoma
  • WHO Grade 2 — astrocytoma
  • WHO Grade 3 — anaplastic (malignant) astrocytoma
  • WHO Grade 4 — glioblastoma multiforme (most common)

The prognosis is worst for Grade 4 gliomas, with an average survival time of 14–18 months. Overall, the five year survival rate is 5%.

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