Frequency based on anatomic location
The data in this study depicted that the highest percentage of the
investigated tumors occurs in infratentorial region of the brain
(including cerebellum, brainstem, hind brain and ventricles) with a
percentage of 82% while the lowest percentage was in spinal regions
with a percentage of 4%. Moreover, in supratentorial regions (including
cerebral lobes, thalamus, hypothalamus and suprasellar masses) the
percentage was 14%.