In general, the causes of the tumor of the auditory nerve are still unknown. None of the environmental factors (such as the use of mobile phones or eating habits) has a proven impact on the development of these tumors. Neurinomas of the vestibulocochlear nerve can be both sporadic (occur without apparent causes), and develop with such a hereditary disease as type 2 neurofibromatosis (NF-2). Sporadic cases account for 95%, while 5% of the remaining neurinas are associated with NF-2.
Neurofibromatosis is a rare disease that can occur in two forms. Type 1 – causes neural tumors throughout the body, especially in the skin. Type 2 – more often affects the central nervous system, in particular causes the development of bilateral neurinomas auditory nerves, creating a risk of complete hearing loss. The bilateral nature of the process influences on treatment, because the priority is the preservation of hearing.
Neurinoma of the vestibulocochlear nerve affects about 10 people per 1 million. Women are more common than men and are usually diagnosed between the ages of 30 and 60 years.