Hi Rick! There was a clinical medical article (clinical study) published in 2013 by doctors at Mayo along this line but it didn't conclude ‘high chance of hearing loss over time’. But it did conclude there was a hearing deterioration in a majority of the patients included in their study, along with various important factors. Authors were Carlson, Jacob, Pollock, Neff, Tombers, Driscoll and Link. Some of these MD’s are ENT surgeons, some neurosurgeons, and some a radiation oncologists. The goals of the study was: 1) to describe the long-term prevalence and timing of hearing deterioration following low-dose (12- to 13-Gy marginal dose) stereotactic radiosurgery (SRS) for vestibular schwannoma (VS); and 2) to identify clinical variables associated with long-term preservation of useful hearing following treatment. Between 1997 and 2002, 44 patients were followed. The study concluded that "durable hearing preservation a decade after low-dose SRS for VS occurs in less than one-fourth of patients. Variables including preoperative hearing capacity and tumor size may be used to predict hearing outcomes following SRS treatment". They state that this could assist in pretreatment risk disclosure (by MD’s) and the importance of long-term follow-up when reporting audiometric outcomes following SRS for VS. Direct message (click on the little envelop on the left under my 'Posts') me with your e-mail and I can send you a copy of the paper if you want. Craig