High grade Glioma - always glioblastoma?

Mother diagnosed with 'high grade glioma' on Thalamus. Waiting on full panel from surgical biopsy. To save myself from Google- can anyone chime in as to whether there are such 'high grade gliomas' that are not glioblastoma. Trying to stay in the positive & envision the best possible type of glioma here. Thanks very much.