Acoustic Neuroma Surgery

Acoustic Neuroma Surgery

Acoustic neuroma surgery (vestibular schwannoma resection) is a specialized craniotomy performed to remove a benign tumor growing on the hearing and balance nerves. Because these tumors are located in the cerebellopontine angle—a crowded space near the brainstem—the primary goal is to remove the tumor while preserving the facial nerve and, if possible, any remaining hearing. This surgery requires extreme precision to protect the delicate structures that control facial movement and balance.

When You Should Consider Acoustic Neuroma Surgery

• Documented Growth: If follow-up MRI scans show the tumor is enlarging, increasing the risk of future nerve damage.

• Brainstem Compression: Large tumors that press against the brainstem can become life-threatening and require surgical decompression.

• Progressive Hearing Loss: When a tumor is still small enough that a hearing-preservation surgical approach is a viable option.

• Balance Instability: Persistent vertigo or dizziness caused by the tumor’s pressure on the vestibular (balance) nerve.

• Facial Twitching or Numbness: Signs that the tumor is beginning to impact the adjacent facial or trigeminal nerves.

How Is Performed

• Anesthesia: The surgery is performed under general anesthesia and typically lasts 4 to 10 hours, depending on the tumor's size and the chosen surgical approach.

• Intraoperative Monitoring: Small electrodes are placed on the face and near the ear to provide real-time nerve monitoring. This provides the surgeon with immediate feedback if the facial or hearing nerves are being stressed.

• Surgical Approaches:
  Translabyrinthine: The surgeon reaches the tumor through the inner ear bone (mastoid). This provides the best view of the facial nerve but results in permanent, total hearing loss in that ear.
  Retrosigmoid (Sub-occipital): An incision is made behind the ear to reach the tumor from behind. This offers a chance to preserve existing hearing.
  Middle Fossa: An opening is made above the ear, used primarily for very small tumors when the primary goal is to save hearing.

• Tumor Removal: Using a high-powered microscope and an ultrasonic aspirator, the surgeon meticulously peels the tumor away from the brainstem and cranial nerves.

• Fat Graft: If the inner ear was opened, a small piece of fat (usually taken from the abdomen) is used to seal the area and prevent cerebrospinal fluid (CSF) leaks.

• Closing: The bone flap is replaced or the opening is covered with a titanium mesh or plate, and the scalp is closed with stitches.

Pre-Procedure Preparation

• High-Resolution MRI: A dedicated "internal auditory canal" protocol scan to map the tumor’s exact relationship to the nerves.

• Audiogram and ABR: Detailed hearing tests to establish your baseline hearing level and the health of the auditory nerve.

• Vestibular Testing: To evaluate how much your balance system has already been affected by the tumor.

• Fasting: Following "nothing by mouth" instructions for 8 hours prior to your scheduled anesthesia.

• Medication Audit: You may be asked to stop taking blood thinners or anti-inflammatory medications several days before the procedure.

Tests Before Acoustic Neuroma Surgery

• Contrast-Enhanced CT Scan: To provide a detailed map of the bone structures surrounding the inner ear and skull base.

• Videonystagmography (VNG): A specialized test to record eye movements and determine the extent of balance nerve involvement.

• Blood Panels: A routine check of your blood count, electrolytes, and clotting factors.

• ECG: A standard heart check to confirm cardiovascular stability for a multi-hour neurosurgical procedure.

Life After Acoustic Neuroma Surgery

• Hospital Stay: Typically 3 to 5 days, usually including at least one night in the Neuro-ICU for intensive monitoring.

• Balance and Vertigo: Since the balance nerve is often removed with the tumor, significant dizziness and vertigo are common for the first few days. The brain usually adapts within a few weeks through "vestibular compensation."

• Activity Restrictions: No heavy lifting or straining for 6 weeks. Most patients return to professional work within 6–12 weeks.

• Vestibular Rehabilitation: Specialized balance therapy is often started shortly after surgery to speed up the brain's ability to compensate for the lost balance nerve.

• Facial Nerve Recovery: If the facial nerve was stretched during surgery, temporary facial drooping may occur; specialized facial exercises and eye care (drops/gels) are necessary during the recovery phase.

Why Specialized Treatment Is Highly Effective

• Advanced Nerve Monitoring: The use of real-time electrical feedback significantly increases the chances of preserving the facial nerve and maintaining your natural appearance.

• Tailored Surgical Approaches: Surgeons can choose the specific "pathway" to the tumor that best balances tumor removal with the goal of hearing preservation.

• Microsurgical Precision: Utilizing high-definition operating microscopes allows for the safe separation of the tumor from the delicate brainstem surface.

• Multidisciplinary Expertise: Care is coordinated between neurosurgeons and neuro-otologists (ear specialists) to manage both the neurological and hearing aspects of the condition.

• Long-Term Tumor Control: For most benign vestibular schwannomas, a complete surgical resection provides a permanent cure with a very low risk of recurrence.