Abstract
Background: Radiation dose to the cochlea has been identified as a key factor in hearing preservation following stereotactic radiosurgery for vestibular schwannoma (VS). There has been little data on hearing outcomes following radiosurgery in patients with non-VS tumors located near and/or extending to the internal auditory canal (IAC). The relationship of radiation dose to the cochlea on hearing preservation in this subset of patients remains unclear. Most studies have utilized MRI-based modiolar point dose and have determined critical cutoff points between 3 to 5.3 Gy to be statistically significantly associated with loss of serviceable hearing after SRS for sporadic VS. This study was performed to assess hearing outcome for non-VS tumors receiving greater than 5 Gy modiolar point dose to the cochlea during gamma knife radiosurgery.
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