Acoustic Neuromas

An acoustic neuroma (also known as vestibular schwannoma, acoustic neurilemoma,
or acoustic neurinoma) is a benign tumor of the vestibular nerve, which connects the
inner ear and the brain.

Though noncancerous and typically slow-growing, acoustic neuromas can affect
both hearing and balance and may cause hearing loss, tinnitus and balance loss. In
rare cases, tumors may become large enough to press against the brain, interfering
with vital processes and even leading to death.

Unilateral acoustic neuroma. This type is the most common and affects just one ear and most commonly develops in people who are 30 to 60 years of age. Unilateral acoustic neuromas result from environmental factors, and although a direct cause is often unclear, past radiation to exposure to the head is a known risk factor.

Bilateral acoustic neuroma. A small percentage of acoustic neuromas result from an inherited disorder called neurofibromatosis type II (NF2)., associated with a malfunctioning gene on chromosome 22. This genetic disorder often causes benign tumors to develop on the balance nerves on both sides of the head.

More often than not, acoustic neuromas are classified as sporadic, meaning their
exact cause is unknown. There is some evidence of a connection between exposure
to low-dose radiation of the head and neck during childhood and acoustic neuromas
development.

There are no known risk factors for acoustic neuromas other than having a parent
with NF2. If this is the case, children have a 50 percent chance of inheriting the
condition themselves.

Because acoustic neuromas usually grow slowly, early symptoms may be difficult to
spot. You may notice a gradual hearing loss and may have tinnitus.

If the tumor continues to grow, additional symptoms are likely to develop. These
include:

Dizziness and vertigo
Facial numbness and weakness
A tingling sensation in the face
Changes in taste
Hoarseness
Difficulty swallowing
Headaches and confusion

Early diagnosis and treatment can help prevent more serious symptoms.

When these tumors go untreated, they can grow. If there is no more room to grow in
the ear canal, the tumor may enter into the skull cavity and put pressure on the
brainstem. This can cause neurological disorders and may be fatal.

Your otolaryngologist will typically diagnose an acoustic neuroma by reviewing your symptoms in conjunction with a hearing test and imaging scans (CT or MRI). Because tumor growth is usually slow, your doctor may simply monitor the tumor’s progress over time, especially when few symptoms are present. Regular imaging tests every six to 12 months can track any growth.

Surgery may be an option for tumors that are growing or causing symptoms. Gamma
Knife radiosurgery delivers radiation without the need for an incision, but results
can take a long time.

Call South Valley Ear Nose & Throat at (801) 566-8304 for more information or to schedule an appointment.