An acoustic neuroma (or Vestibular Schwannoma) is a benign, slow-growing tumour that originates in the canal connecting the brain to the inner ear, from the 8th cranial nerve. The 8th cranial nerve is actually two separate nerves, one associated with balance and the other with hearing; and the tumour can arise from the supporting cells (Schwann cells) covering the balance nerve as it passes from the inner ear to the brain stem.