How fast does a glioblastoma multiform spread?

Glioblastoma multiforme (GBM) is an aggressive brain tumor known for its rapid growth and infiltration into surrounding brain tissue. It can double in size within a matter of weeks, often leading to significant neurological symptoms in a short period. Due to its invasive nature, complete surgical removal is challenging, and recurrence is common even after treatment. Overall, GBM is associated with a poor prognosis, with median survival rates typically ranging from 12 to 15 months after diagnosis.