2019 Volume 122 Issue 1 Pages 52-58
Superior semicircular canal dehiscence syndrome (SSCDS) is important to differentiate from patulous eustachian tube (PET). We report a 50-year-old woman with SSCDS accompanied by PET who presented with dizziness. She visited our hospital with a month's history of gradually progressive dizziness associated with left autophony. She also gave a history of having suffered from bilateral autophony for the previous one year that was relieved by lying down in the head-down position. The diagnosis of PET was aided by positional-change eustachian tube function testing, which revealed no show sound- or pressure-induced eye movements. Ocular VEMP testing to ACS 2 kHz tone bursts revealed a large amplitude of 46 μ V on the left side and a low threshold of 80 dBSPL. CT revealed superior (anterior) semicircular canal dehiscence on the left. We administered conservative treatment for the PET. As the PET improved, the dizziness also resolved.
