They are the same thing, glioblastoma multiforme is the full technical name for this form of brain cancer.

Glioblastoma (GBM) can effect everyone around you. It is a very aggressive type of brain cancer.

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Glioblastoma is a malignant tumor of the brain. It often invasive and agressive form of brain tumor whereas Glioma is often a benign primary brain tumor. Glioblastoma has the tedency to spread locally or to other part of the brain. Treatment of Glioblastoma includes combination of surgery, radiatoin with or without chemotherapy. Gliomas usually do not spread and are treated by resection alone.

A glioblastoma (glio=glial cells, -blast=immature cell, oma=tumor, mass)