-Tumors based on origin:
1-Covering of the brain (e.g., dural meningioma).
2-Cranial nerves (e.g., acoustic neuroma).
3-Brain tissue (e.g., glioma).
4-Pituitary and pineal glands.
5-Cerebral blood vessels (e.g., hemangioblastoma).
6-Congenital tumors (e.g., dermoid cyst).
-Types:
A-Primary: Originate within the brain.
B-Secondary: Metastases from lung, breast, GI tract, pancreas, kidney, or skin.