Brain Tumours - Acoustic Neuroma An acoustic neuroma is a non-cancerous growth that occurs near the facial nerve. They are slow-growing and may remain the same size for years for some patients. In a small number of patients, the tumour becomes smaller with time. [Please download the PDF file if you are unable to view the image below.] Content serves as a guide only. Seek the advice of your doctor for more details Information correct as of April 2020 Reproduced with permission from the National Neuroscience Institute (NNI)