Korean J Otorhinolaryngol-Head Neck Surg.  2008 Aug;51(8):738-741.

A Case of Superior Canal Dehiscence Syndrome as a Cause of Step-Synchronous Tinnitus

• Park GH
• Park HJ
• Kwak HB
• Lee YJ
• Moon WJ

Abstract

The superior canal dehiscence syndrome (SCDS) is a rare disorder caused by the dehiscence of the temporal bone overlying the superior semicircular canal. It has become apparent that SCDS can lead to a variety of clinical manifestations, vestibular and/or auditory, in contrast to the typical symptoms, as initially described. We recently examined a 54-year-old woman with unilateral stepsynchronous tinnitus without any vestibular symptoms. Tinnitus is a quite unremarkable finding among variable symptoms of the syndrome; however, it can be one of the clues to identify SCDS when it is accompanied by low-frequency conductive hearing loss. Therefore, in diagnosing SCDS, attention must be also paid to those patients with nonspecific complaints, for example, stepsynchronous tinnitus.

Keyword

Superior canal dehiscence syndrome; Tinnitus; Conductive hearing loss

MeSH Terms

Female
Hearing Loss, Conductive
Humans
Middle Aged
Semicircular Canals
Temporal Bone
Tinnitus