What is an acoustic neuroma?

Acoustic neuroma (also known as a vestibular schwannoma) is a low grade brain tumour accounting for 8% of all primary brain tumours. They tend to affect adults between the ages of 30 to 60. Vestibular schwannomas are slow growing and are rarely life threatening.

This type of tumour grows along the eighth cranial nerve in the brain, also known as the acoustic or vestibulocochlear nerve. As the nerve controls hearing and balance, loss of hearing in one ear, or problems with balance, are common symptoms. The tumour arises from a type of cell called a schwann cell. Schwann cells wrap themselves around nerves to protect them and support their function.

What causes Acoustic Neuromas?

The cause of acoustic neuroma is unknown, however around 7% of cases are caused by a rare genetic disorder known as Neurofibromatosis type 2 (NF-2). This type of genetic condition causes low grade tumours to grow along your nerves. NF-2 is caused by a permanent change, or gene mutation, in the DNA sequence that makes up a gene. This in turn means that the growth of nerve tissue can become uncontrolled. In half of all cases of NF-2, the mutation is passed on from one generation the other. i.e. parent to child. Although there are genetic tests that can be carried out during pregnancy to test whether your child will have NF-2, it is normally diagnosed after birth.

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