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%.