측두골 전산화단층촬영에서 상반고리관 결손의 빈도와 상부 골벽의 두께 측정

Background: Superior semicircular canal dehiscence syndrome (SCDS) is diagnosed by clinical symptoms and signs. Computed tomography (CT) has been used to confirm the diagnosis. A consecutive series of temporal bone CT scans was reviewed to define the prevalence of a dehiscent-appearing superior semicircular canal in temporal bone and measured to know the thickness of bone overlying the superior semicircular canal. These datas support to make a diagnosis of SCDS. Methods: Retrospective review of CT scans of the temporal bone performed at our institution between January 2006 and December 2008. Prevalence figures for dehiscent-appearing superior semicircular canal were determined by consensus. An additional 50 control subjects who underwent temporal bone multi-detector row CT for other reasons, were prospectively selected to measure the thickness of bone overlying the superior semicircular canal. Results: A dehiscent-appearing superior semicircular canal was seen in 30 ears (1.5%) of studies, at the middle fossa floor (n=22) and where the superior petrosal sinus was in contact with the canal (n=8). The thickness of bone overlying the superior canal in controls measured 1.02 ±0.42 mm (mean ± SD). And the thickness of the bone overlying the superior canal on one side correlated with that on the other side in controls (r=0.62, p< 0.0001). Conclusions: Determination of Superior canal dehiscence (SCD) should be based on the coronal CT scans that correlated with clinical symptoms. (J Clinical Otolaryngol 2012;23:206–211)