Acoustic neuroma surgery outcomes

Area of Science:

• Neurosurgery
• Otolaryngology
• Neuro-oncology

Background:

• Acoustic neuroma (vestibular schwannoma) surgery outcomes have significantly improved with advancements in surgical techniques, intraoperative monitoring, and imaging.
• Modern goals include preserving facial nerve function and, when possible, hearing function.
• Previous studies often lack standardized grading, limiting comparisons of outcomes with contemporary methods.

Purpose of the Study:

• To evaluate the outcomes of acoustic neuroma surgery using modern techniques and standardized grading systems.
• To assess facial nerve function preservation and hearing preservation rates.
• To report complication rates associated with contemporary surgical management.

Main Methods:

• Retrospective review of 97 patients who underwent acoustic neuroma surgery between 1992 and 1998 at a tertiary referral center.
• Preoperative audiograms and MRI with contrast were performed. Facial nerve function was graded using the House-Brackmann scale.
• Intraoperative facial nerve monitoring was utilized. Hearing preservation was attempted in patients with preoperative hearing grades A or B.

Main Results:

• Facial nerve integrity was preserved in 99% of patients (96/97). Excellent facial nerve function (HB 1-2) was achieved in 100% of intracanalicular tumors, 95% of small tumors, and 63% of medium tumors.
• Serviceable hearing was preserved in 29% of patients with tumors smaller than 2 cm.
• The overall complication rate was 20%, with cerebrospinal fluid leak being the most frequent complication.

Conclusions:

• Modern acoustic neuroma surgery, utilizing advanced imaging and techniques, is safe and yields excellent outcomes.
• Surgery remains the primary treatment for most acoustic neuromas, pending long-term data from alternative therapies like Gamma Knife.
• Standardized grading systems are crucial for comparing results across different treatment modalities.