Clinical aspects of brain tumor.

New approaches to treating patients with malignant brain tumors use advanced magnetic resonance and positron imaging. Clinical protocols to treat oligodendroglial-containing tumors, brain lymphoma or primitive neuroectodermal tumor make use of systemic administration of drugs before irradiation. Chemotherapy directed into tumor is provided for recurrent glioblastoma as is reoperation and the use of stereotactic radiosurgical boosts.