Before revision: The growth rate and mean interval between onset of symptoms and diagnosis is approximately 1 –2 years but is highly variable, being intermediate between that of low-grade astrocytomas and glioblastomas.
After revision: The growth rate and mean interval between onset of symptoms and diagnosis is approximately 1.5 –2 years but is highly variable, being intermediate between that of low-grade astrocytomas and glioblastomas.