Brain stem gliomas: an autopsy study of 25 cases.

The study analyzed the extent of tumor at autopsy in 25 patients with a brainstem glioma. Primary tumor in the pons comprised the majority of cases, followed by medulla and midbrain. Histologically, 48% of the tumors were glioblastoma multiforme. The tumor spread was found to be dependent on the site of origin and the grade. Pontine tumors involved the adjacent structures more extensively than the tumors of midbrain and medulla. Contiguous cephalad and caudad involvement was frequent with Grade III and Grade IV tumors. The extent of meningeal involvement was limited to those surrounding the main tumor mass. It is concluded that in the treatment of brainstem gliomas, irradiation through fields limited to the brainstem, adjoining temporal lobes, cerebellum, and proximal spinal cord would be adequate.