Acoustic neuromas are rare, benign brain tumors that belong to the group of neuromas that are also known as schwannomas. Their name is derived from the fact that they originate from Schwann cells, which are connective tissue cells that surround the thin fibers of the cranial nerves.
Acoustic neuromas consist of unchecked growth of Schwann cells in the nerve sheath of the 8th cranial nerves (vestibulocochlear nerve), which is made up of the auditory nerve (cochlear nerve) and the equilibrium nerve (vestibular nerve).
Doctors are not sure what causes acoustic neuroma, or indeed the reasons why Schwann cells start to grow uncontrollably. For this reason, it can also not be prevented.