Menengiomas arises from brain membranes like Dura Mater or Archnoid membran cells. These tumors are known as benign tumors. Generelly these tumorsa are seen after 45 years old. But some times may be seen in children. Menengiomas ara named due tu localisation that were explained; Convexity Menengiomas, Falx Cerebry Menengiomas, Sfenoid Wing Menengiomas, Tentorial Menengiomas, Petroclival Menengiomas, Foramen Magnum Menengiomas, Clivus Menengiomas, Tuberculum Sella Menengiomas, Olfactor Sulcus Menengiomas, Intraventricular Menengiomas, Pineal Area Menengiomas.
Eventually in some conditions these tumors named by aggresivity like Angiomatous Menengiomas and Anaplastic Menengiomas. In some diseases menengiomas may be multiple, This condition is seen at Neurofibromatosis Disease.
Acoustic neuroma is an uncommon, noncancerous (benign) and usually slow-growing tumor that develops on the main nerve leading from your inner ear to your brain. Because branches of this nerve directly influence your balance and hearing, pressure from an acoustic neuroma can cause hearing loss, ringing in your ear and unsteadiness. Also known as vestibular schwannoma, acoustic neuroma usually grows slowly or not at all.
However, in a few cases, it may grow rapidly and become large enough to press against the brain and interfere with vital functions. Treatments for acoustic neuroma include regular monitoring, radiation and surgical removal.
Pituitary adenomas are common benign tumors of the pituitary gland. It is said that up to 10% of people will have a pituitary adenoma (which might never have caused a problem) by the time of their death. Some tumors secrete one or more hormones in excess. Such so-called secretory pituitary adenomas are usually found due to hormonal imbalances that affect bodily functions. They may be relatively small when detected.
People can develop pituitary adenomas at any age. Most pituitary adenomas are in the front part (anterior lobe) of the pituitary gland.
Astrocytomas are tumors that arise from astrocytes—star-shaped cells that make up the "glue-like" or supportive tissue of the brain. These tumors are "graded" on a scale from I to IV based on how normal or abnormal the cells look. There are low-grade astrocytomas and high-grade astrocytomas.
Low-grade astrocytomas are usually localized and grow slowly.
High-grade astrocytomas grow at a rapid pace and require a different course of treatment. Most astrocytoma tumors in children are low grade. In adults, the majority are high grade.
Hemangioblastomas (capilliary hemangioblastomas) are tumors of the central nervous system that originate from the vascular system usually during middle-age. Sometimes these tumors occur in other sites such as the spinal cord and retina. They may be associated with other diseases such as polycythemia (increased blood cell count), pancreatic cysts and Von Hippel-Lindau syndrome (VHL syndrome)(NolanR).
Hemangioblastomas are most commonly composed of stromal cells in small blood vessels and usually occur in the cerebellum, brain stem or spinal cord. They are classed as grade one tumors under the World Health Organization's classification system.