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Acoustic Neuromas
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A neuroma or schwannoma is a benign tumor of the cells that form the "insulation" around a nerve. A common location for one of these types of tumors in the skull is along the course of the eighth cranial nerve (the acoustic or hearing nerve) as it exits the brain stem and enters the hard bone surrounding the inner ear. A tumor in this location, called an acoustic neuroma, can not only affect hearing, but also balance, facial muscle function, and sensation about the mouth and face. Successfully documented treatment options for these tumors include microsurgery and Gamma Knife radiosurgery. Microsurgery has the advantage of quickly relieving the pressure caused by compression, potentially reversing neurological deficits that first occurred or progressed within weeks of surgery. Deficits present for longer periods (e.g. months or years) are unlikely to be reversed. For small neuromas, microsurgery may be able to spare dysfunction of the nerves that control facial function. While Gamma Knife radiosurgery has a much slower treatment effect, it too has specific advantages. Gamma Knife radiosurgery has documented tumor control rates of up to 95 percent. The tumor is not actually removed, and often follow-up scans show only modest shrinkage. Instead, the goal of Gamma Knife radiosurgery for acoustic neuromas is to achieve growth arrest of the tumor while preserving associated cranial nerve function. With care and experience in conformal field shaping and dosing, the risk of facial palsy with Gamma Knife radiosurgery of acoustic neuromas is only 5 to 10 percent. In addition, the treatment is typically very well tolerated as an outpatient procedure. Previously employed patients typically return to work within 2 to 3 days of the procedure. [Keywords: neuroma, schwannoma, benign tumor, Gamma Knife radiosurgery] Disclaimer: The information provided is not intended to replace the advice of a medical professional. If you have medical concerns, seek the guidance of a medical professional. Consult your physician about any medications, supplements or treatments you are considering, and when seeking treatment, disclose all medications you are taking or treatments you are receiving. Riley Hospital for Children, University Pediatric Associates and IU School of Medicine disclaim any liability for the decisions you make based on this information. |
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