“…Regarding the location of brain tumors, a frequency of posterior fossa tumors was found in 22.4%, which is similar to that reported by Ostrom et al 7 , whose five most frequent locations were: cerebellum, with 18.5%; other brain regions, with 15.2%; brainstem, with 12.4%, followed by pituitary and craniopharyngeal duct (8.1%) and cranial nerve tumors (7.5%). As regards histological variants, Azad et al 14 reported that the most common was ependymoma, with 19.4%, followed by pilocytic astrocytoma and medulloblastoma with 16.7% each, while, in our findings, the most common was medulloblastoma with 22.4%, followed by pilocytic astrocytoma and neuroectodermal tumor with 16.5% and 8.2%, respectively; similarly, Shirazi et al 19 found medulloblastoma (n = 11, 20.37%) to be the most common neoplasm. In turn, Zhou et al 20 , in their study carried out in China with 1,485 cases, found astrocytoma (31%), craniopharyngioma (18%), medulloblastoma (15%), germ cell tumors (8%) and ependymal tumors (6%) to be the most common CNS tumors.…”