What are brain tumors?

Glioma is the most common epithelial tissue tumor, accounting for 80% of primary intracranial malignant tumors. It is divided into 4 grades, of which grade I and II are benign, called low-grade glioma, and grade III and IV are malignant, called high-grade glioma. 2. Acoustic neuroma Acoustic neuroma originates from Schwann cells of vestibular nerve, usually benign tumor, and most of them grow unilaterally, and the disease develops relatively slowly. 3. Meningioma Meningioma originates from meninges and meningeal space derivatives, which is benign tumor, slow growth and long course. 4. Sella turcica region tumor refers to tumors originating in the sella turcica region, including pituitary adenoma, craniopharyngioma, etc. These tumors are generally benign, but craniopharyngioma may deteriorate during development. In addition, there are other types of brain tumors, such as congenital tumors (such as epidermoid cysts, craniopharyngiomas, teratomas, etc.) and secondary intracranial tumors (i.e., tumors secondary to other systems, such as those from the lungs, rectum, digestive tract, liver, stomach, prostate, etc.).