The Oregon Acoustic Neuroma Center at The Oregon Clinic

The Oregon Acoustic Neuroma Center at The Oregon Clinic


The mission of the OANC is to provide the highest quality, comprehensive multimodality treatment for patients with acoustic neuromas and other skull-base tumors. Our goal is to preserve hearing and facial nerve whenever possible by using the most up-to-date and comprehensive treatments available.

Our physicians are Oregon’s experts in successfully addressing acoustic neuroma, with experience in over 600 cases. All cases are reviewed by Medical Directors in the areas of neuro-otology, neurosurgery and radiation oncology. Our multimodality approach allows us to provide coordinated, comprehensive treatment resulting in improved outcomes and more immediate care. 

We have a fast-track option for patients from outside of the Portland area, allowing for appointments with providers and procedures to be scheduled together.  Please let our scheduler know if you are from outside of the Portland area. 


The providers with the OANC have the most extensive surgical and radiosurgical experience in the treatment of acoustic neuroma in Oregon and are one of the most experienced teams in the Pacific Northwest. With almost 400 surgical cases and 300 radiosurgery cases we are proud to offer comprehensive multi-modality treatment. We have extensive experience with all surgical approaches, including hearing preservation surgery and utilize the Gamma Knife Perfexion for radiosurgical treatment

Areas of Focus
  • Prostate Cancer
  • Stereotactic Radiosurgery using the Gamma Knife
  • Breast Cancer
  • Gastrointestinal Cancer
  • Head & Neck Malignancies
Areas of Focus
  • Microsurgical & Endoscopic Skull Base Surgery
  • Microsurgical & Endoscopic Brain Tumor Surgery
  • Acoustic Neuroma Surgery
  • Endoscopic Pituitary Surgery
  • Minimally Invasive Brain & Spine Surgery
Areas of Focus
  • Image-guided Intensity Modulated Radiotherapy (IGRT/IMRT)
  • Stereotactic Radiosurgery (Gamma Knife)
  • Stereostatic Ablative Body Radiotherapy (SBRT/SABR)
  • High Dose Rate (HDR) Brachytherapy
  • 3D Conformal Radiotherapy
Areas of Focus
  • Benign & Malignant Diseases of the Central Nervous System
  • Gamma Knife Stereotactic Radiosurgery
  • Head & Neck Malignancies
  • Lung Cancer
  • Stereotactic Body Radiation Therapy (SBRT)
Areas of Focus
  • Gamma Knife Stereotactic Radiosurgery
  • Stereotactic Body Radiation Therapy (SBRT)
  • MRI-Guided SBRT (MRLinac)
  • Prostate High Dose Rate (HDR) Brachytherapy
  • Intra-Operative Radiation Therapy (IORT)
Areas of Focus
  • Otology & Neurotology
  • Cochlear Implantation
  • Implantable Hearing Devices (Ponto, Baha, Bonebridge)
  • Tympanoplasty (Eardrum Repair)
  • Surgery for Surfer’s Ear

Patient Education

Acoustic neuromas (also known as vestibular schwannomas) are non-cancerous tumors that arise from the nerve between the brain and inner ear. This nerve is responsible for hearing and balance control. Acoustic neuromas are typically slow-growing tumors that over time displace the surrounding tissue. 

Symptoms can include tinnitus (ringing in the ear), hearing loss on one side, and balance difficulties.  Larger tumors can cause facial numbness, facial weakness, and headaches.  Very large tumors can cause severe pressure on the brainstem and cerebellum and can be life-threatening.

Treatment options include observation (for small tumors), radiosurgery and surgical resection. Treatment is determined by symptoms, tumor size, patient age, and health. 

There are three surgical approaches.  The middle fossa approach is used for small tumors where hearing preservation is the goal. The retrosigmoid approach is also used for hearing preservation and for larger tumors. The translabyrinthine approach is utilized for larger tumors where hearing is already compromised. 

Each case is carefully reviewed and the best treatment options discussed with the patient and their family.  Our goal is to achieve the best outcome for each patient’s unique circumstance.

If you have been diagnosed with an acoustic neuroma and are seeking treatment, please call 503-935-8541.  If you have not been diagnosed, but are concerned because your symptoms could indicate an acoustic neuroma, please contact your primary care physician for preliminary testing. 

Case Studies

Case Studies

Case 1
A 42-year-old woman came into our clinic complaining of very mild right-sided hearing loss. Her MRI (Figure 1) demonstrated an 8 mm right-sided acoustic neuroma. The treatment that was determined to be appropriate was surgery. We removed her tumor via a right middle fossa approach.

The patient had an excellent clinical outcome with preservation of both right-sided hearing and facial nerve function (Figure 2).

Case 2
A 30-year-old man came into our clinic complaining of headaches and problems with balance. His MRI (Figure 3) demonstrated a 4.5 cm left-sided acoustic neuroma. The treatment that was determined to be appropriate for him was surgery. He underwent a retrosigmoid craniotomy for resection of the tumor. His postoperative MRI demonstrated no residual tumor (Figure 4).

The patient is doing very well with full preservation of his facial nerve function after surgery.

Case 3 
A 56-year-old woman came into our clinic with dizziness and hearing loss. Her MRI (Figure 5) demonstrated a 3-cm left-sided acoustic neuroma. The treatment determined to be appropriate for her was surgery. She underwent a left-sided translabyrinthine approach. Her postoperative MRI demonstrated total resection of the tumor (Figure 6). The bright area (*) is fat packing use to fill approach site.

The patient is doing very well with full preservation of her facial nerve function after surgery.