Incidence The<unk>  is a rare neoplasia: its incidence is less than 1% of all brain tumors. It represents up to 5% of<unk> s. Age and sex distribution The mean age at clinical presentation is 42. The age distribution includes children and has a wider range than other diffuse astrocytomas (diffuse WHO grade II astrocytoma, anaplastic astrocytoma, ordinary<unk> . The<unk>  affects males more frequently. (The M/F ratio is 1.6.)
Giant-cell glioblastoma
Subependymal giant cell astrocytoma
Fibrillary astrocytoma
Glioblastoma
Anaplastic astrocytoma
Neurothekeoma
Hemangioblastoma
Pilocytic astrocytoma