Identification of Superior Semicircular Canal Dehiscence
PG was a 39-year-old female who presented to an audiology clinic due to increasing unsteadiness and loss of balance with quick head movements over the past 5 years. She also noted that her ability to visually fixate was impaired (i.e., oscillopsia) or “did not keep up” especially when she was running or walking on uneven surfaces. As a result, she experienced difficulty monitoring her students’ computer screens during her work as an instructor in a media center. Otologic reports included aural fullness in the left ear and a loud heartbeat sound in her head, but not isolated to either ear. PG denied any true vertigo, tinnitus, otalgia, or history of noise exposure. Her current medications included duloxetine and alprazolam. Previous records from an outside facility indicated a normal audiological examination and unremarkable findings for electroencephalography (EEG), computed tomographic (CT) scan, magnetic resonance imaging (MRI), and magnetic resonance angiography (MRA). As part of her care at the audiology clinic, PG was referred for a comprehensive audiological and vestibular examination including videonystagmography (VNG), cervical vestibular-evoked myogenic potentials (cVEMPs), and computerized dynamic posturography (CDP).