This slow-growing, non-cancerous tumor can be difficult to diagnose because its onset can be very gradual and symptoms common to other disorders. Acoustic neuromas make up about eight percent of all tumors found inside the skull.  Gamma Knife® is an excellent treatment option if you suffer from acoustic neuroma, as these lesions are located on the highly sensitive auditory nerve.

What is an acoustic neuroma?

An acoustic neuroma, also known as a vestibular schwannoma, is a non-cancerous tumor that develops along the auditory nerve, which connects the ear to the brain. As the tumor grows, it presses against the hearing and balance nerves.

Acoustic neuromas generally affect only one ear. Bilateral acoustic neuromas, those which affect both ears, can occur in a hereditary disorder called neurofibromatosis type II and account for approximately five percent of cases.

What are the Benefits of Gamma Knife Treatment for Acoustic Neuromas?

What are the symptoms of acoustic neuroma?

The signs and symptoms of acoustic neuroma come on slowly because the tumor itself is usually slow growing. People generally first notice symptoms between the ages of 30 and 60. Symptoms of acoustic neuroma may include:

  • Difficulties with speech and swallowing
  • Dizziness or loss of balance
  • Headaches
  • Hearing loss
  • Tinnitus (ringing in the ear)

If the tumor grows large, it can cause facial numbness, weakness, or even paralysis, on the side of the face with the tumor. Left untreated, it may eventually press against the brainstem and cause cerebrospinal fluid buildup in the brain, a dangerous condition called hydrocephalus.

Gamma Knife® treatment for acoustic neuroma

Gamma Knife is a minimally invasive treatment with the precision of surgery. Gamma Knife uses highly targeted, high-dose radiation to destroy the DNA of tumor cells so they can no longer reproduce. Surrounding tissue remains unharmed, and patients remain awake for the procedure and go home the same day – no hospital stay is required.

What are the side effects of Gamma Knife treatment for acoustic neuroma?

Side effects such as facial weakness and numbness are uncommon, under one percent.  The useful hearing preservation rate is the highest achieved by all technologies: on average 71 percent of patients have useful hearing preserved.

How long is the recovery for Gamma Knife treatment of acoustic neuroma?

The full healing process takes three to four months.

Will I recover hearing I have lost due to acoustic neuroma?

You should expect treatment to preserve the hearing you still have, but not hearing improvement. No part of hearing loss will be restored.

Who is a good candidate for Gamma Knife treatment for acoustic neuroma?

Your primary care doctor, ENT or neurologist, and team at South Sound Gamma Knife will decide if you are a good candidate for treatment. For many patients, Gamma Knife stereotactic radiosurgery may be a preferred option to stop the growth of the tumor. Gamma Knife can also be used as a follow-up to traditional surgical removal if it is not possible to remove the tumor completely without causing further damage. Gamma Knife may also be used to treat regrowth after surgery, as regrowth occurs in about eight percent to 10 percent of cases.

What are the risks of Gamma Knife treatment for acoustic neuroma?

Potential risks include post-treatment edema (swelling), which can result in temporary hearing loss, cranial nerve damage (numbness) and fatigue.

Is Gamma Knife an effective treatment for acoustic neuroma?

Of all available technologies, Gamma Knife has the highest effectiveness rate for preserving hearing. About 71 percent of patients have useful hearing preserved. That’s why today nearly half of all newly diagnosed acoustic neuroma patients have their tumors treated with Gamma Knife.

South Sound gamma knife

Schedule an appointment

If you have been diagnosed with acoustic neuroma, ask your doctor about Gamma Knife treatment or call 866.254.3353 to schedule an appointment and learn if Gamma Knife treatment may be right for you.

What to Expect

Patient Story

Gamma Knife FAQ

Understanding Essential Tremor

Unlike other neurological disorders or conditions that may cause tremors like Parkinsons', essential tremor does not include any additional neurological issues. However, the disorder can impede daily activities and interfere with routine tasks. Simple things such as using a phone, writing notes, buttoning up clothing, and even preparing a meal can become time-consuming and frustrating. 

Essential Tremor Symptoms

Essential tremor symptoms present as small, but rapid uncontrollable movements. These movements can occur occasionally, constantly, or frequently and they can affect one or both sides of the body. Essential tremor is most often noticeable in someone if they are attempting an intentional activity that draws attention to their movements. While individuals who are 60 or older are typically the age group diagnosed with essential tremor, younger people can also be affected. Certain factors like smoking, caffeine consumption, too much stress, or a lack of sleep can make a tremor worse.

Medications for Essential Tremor

For many patients, the first line of treatment for essential tremor involves medication. Beta-blockers, such as propranolol, are commonly prescribed to reduce tremor severity. However, these medications are not suitable for everyone, particularly those with asthma, diabetes, or certain heart conditions. 

Gamma Knife® Treatment for Essential Tremor

Gamma Knife® treatment represents a cutting-edge approach to managing essential tremor. This technology uses a precise, high-dose radiation beam to target and destroy specific tissue. By interrupting the signals that the brain sends to the muscles, Gamma Knife® effectively reduces the uncontrollable movements associated with essential tremors. One of the significant advantages of this treatment is that it is non-invasive, requiring no surgical incisions or hospital stays. The procedure is completed in a single day, allowing patients to return home immediately after treatment.

Gamma Knife® treatment is particularly beneficial for patients who cannot take traditional medications or who have not responded to them. 

Effectiveness of Gamma Knife® Treatment

Patients undergoing Gamma Knife® treatment typically notice a reduction in tremor symptoms within three to six months following the procedure. This gradual improvement can lead to a significant enhancement in the quality of life, allowing individuals to perform daily activities with greater ease and confidence.

Essential tremor is a challenging condition that affects many aspects of daily life. Treatment options range from medications to innovative procedures like Gamma Knife® treatment, which offers significant relief for patients who cannot take traditional medications or who have not found success with other treatments. By targeting the root cause of tremors with precision and efficiency, Gamma Knife® can dramatically improve the quality of life for those living with essential tremor.


To learn more about whether Gamma Knife treatment is right for you, speak with your doctor or call South Sound Gamma Knife at 866.254.3353.

For individuals facing acoustic neuromas, radiation therapy offers hope. Gamma Knife is a minimally invasive stereotactic radiosurgery that provides surgical precision without extended hospital stays. Utilizing highly focused, high-dose radiation, Gamma Knife dismantles tumor cell DNA while sparing surrounding tissue. Patients can undergo this procedure while awake and often return home the same day, bypassing prolonged hospitalization.

Understanding the Symptoms of Acoustic Neuroma

The symptoms of an acoustic neuroma (vestibular schwannoma) vary, typically manifesting between ages 30 and 60. Initially subtle, they may include speech and swallowing difficulties, dizziness, headaches, hearing loss, and tinnitus. As the tumor progresses, it may lead to facial numbness, weakness, or even paralysis on the affected side, and in severe cases, it can compress the brainstem, causing hydrocephalus.

Side Effects and Recovery from Gamma Knife Surgery

One of the key benefits of Gamma Knife treatment is its low incidence of side effects. Facial weakness and numbness, occurring in less than one percent of cases, are rare, and the preservation of useful hearing surpasses that of other treatments, with an average of 71 percent of patients retaining hearing functionality. Recovery typically spans three to four months, allowing patients to gradually resume daily activities with renewed hope and improved health.

Patient Eligibility and Risk Assessment

Determining patient suitability to treat acoustic neuroma with Gamma Knife involves collaboration between the primary care provider, ENT or neurologist, and the medical team overseeing the procedure. While many patients view Gamma Knife surgery as their preferred treatment option for halting tumor growth, it can also serve as a follow-up to conventional surgical interventions or address tumor regrowth post-surgery, which occurs in approximately eight to ten percent of cases. Despite the treatment efficacy, potential risks such as post-treatment swelling, temporary hearing loss, cranial nerve damage, and fatigue warrant consideration and thorough risk assessment.

Evaluating the Effectiveness of Gamma Knife Treatment

When weighing treatment options for acoustic neuroma, efficacy is paramount. Gamma Knife treatment shines as the gold standard, boasting the highest effectiveness rate for preserving hearing among all available technologies. About 71 percent of patients retain useful hearing, and nearly half of all newly diagnosed acoustic neuroma cases are treated with Gamma Knife.

Beyond Gamma Knife Treatment and its Benefits

Beyond its efficacy in addressing the physical manifestations of acoustic neuroma, Gamma Knife treatment offers patients the prospect of a better quality of life. By preserving hearing and minimizing side effects, this innovative approach not only addresses the immediate medical concern but also alleviates the emotional and psychological burden often associated with debilitating conditions. Patients can regain a sense of control over their health and well-being, enabling them to focus on pursuing their passions and enjoying meaningful interactions with loved ones.

Embracing Hope and Innovation in Acoustic Neuroma Treatment

Gamma Knife treatment stands as a beacon of hope for individuals grappling with acoustic neuroma. Its minimally invasive nature, exceptional efficacy, and focus on preserving quality of life make it a preferred choice for many patients and healthcare providers alike. Ongoing research and innovation promise to further enhance the effectiveness and accessibility of Gamma Knife treatment, offering renewed hope and improved outcomes for individuals facing the challenges of acoustic neuroma.

Located at St. Joseph Medical Center in Tacoma, WA, South Sound Gamma Knife is the sole Gamma Knife center situated between Seattle, WA, and Portland, OR. It provides patients across the region with access to a uniquely tailored facility, cutting-edge technology, and an unmatched team of neurosurgeons, radiation oncologists, radiation physicists, nurses, and other experts.

For patients who have been diagnosed with acoustic neuroma, you can explore your treatment options, including Gamma Knife, by speaking with your primary provider. Or, call 1-866-254-3353 to learn more about our resources and services.