The Role of Acoustic Neuroma in Hearing Loss

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An acoustic neuroma is a benign tumor, so it is not cancerous. While these growths are typically slow-growing and affect only one ear, they can disrupt normal function by pressing on nearby structures. Understanding their development and effects is a key step in managing them. Here is more information about acoustic neuromas and hearing loss:

Develops on an Ear Nerve

An acoustic neuroma grows on the vestibulocochlear nerve. This nerve connects your inner ear to your brain, so the tumor’s location is significant. These growths typically originate on the vestibular portion of the nerve, which is responsible for balance, and then spread. Their size can vary from a few millimeters to several centimeters. The tumor’s proximity to the cochlea and brainstem may lead to noticeable symptoms as it enlarges.

These tumors develop from an overproduction of Schwann cells. While the exact cause is unknown, they are linked to a malfunction on a chromosome. This genetic issue disrupts the normal regulation of cell growth, and this disruption leads to the formation of a tumor.

The growth rate of an acoustic neuroma is typically slow. Many expand by only one to two millimeters per year, and some may not grow at all. This slow progression allows for a period of observation, but regular monitoring is necessary. Medical professionals track changes to determine the right course of action.

Places Pressure on the Nerve

As the acoustic neuroma expands, it places mechanical pressure on the nerve. This compression can interfere with the nerve’s function. The tumor may also compromise the nerve’s blood supply, which further affects its ability to work correctly.

This pressure disrupts the transmission of nerve signals. The protective myelin sheath around the nerve fibers may degrade, and this process is called demyelination. This damage slows or blocks the electrical impulses traveling between the inner ear and the brain. Without clear signals, the brain cannot accurately interpret sounds or balance information.

Leads to Hearing Loss

Hearing loss from this condition typically develops gradually. It normally presents as a unilateral sensorineural hearing loss, which means it affects one ear. You may also experience a decline in word recognition that seems out of proportion with the level of hearing loss.

This condition is often accompanied by other symptoms. Tinnitus, which is a ringing in the ear, is another condition, and you may also feel unsteady or off-balance. These symptoms can be similar to those of other inner ear conditions, so a thorough evaluation is necessary. Other disorders with similar symptoms include:

Meniere’s disease
Otosclerosis
Hearing loss

Improves With Radiation or Surgery

Treatment for an acoustic neuroma depends on several factors. Doctors evaluate the tumor’s size, its growth rate, and your overall health. Sometimes, observation with periodic MRI scans is the chosen path, especially if the tumor is small and not growing.

For growing or symptomatic tumors, treatment may be recommended. Stereotactic radiosurgery uses focused radiation beams to stop the tumor’s growth. Microsurgery is a procedure to remove the tumor, but it carries risks like facial nerve injury and cerebrospinal fluid leaks. Both approaches require careful planning to manage potential complications.

Treat an Acoustic Neuroma

An acoustic neuroma develops on the nerve connecting the ear to the brain, and it causes symptoms by pressing on this nerve. If you are experiencing hearing loss, tinnitus, or balance problems, seek a comprehensive evaluation from a qualified medical team. Contact an ear specialist today to schedule an appointment and discuss your symptoms to determine the proper treatment.