High-resolution CT Findings Suggest a Developmental Abnormality Underlying Superior Canal Dehiscence Syndrome
Source: Acta Oto-Laryngologica, Volume 123, Number 4, May 2003 , pp. 477-481(5)
Publisher: Informa Healthcare
Abstract:Objective--Patients with superior canal dehiscence (SCD) syndrome experience vertigo and oscillopsia with loud sounds and/or stimuli that result in changes in middle ear or intracranial pressure. Findings on temporal bone CT were analyzed to determine if a developmental abnormality is associated with the syndrome. Material and methods--Temporal bone CT scans [0.5 mm collimation and projections into the superior semicircular canal (SC) plane] were used to compare the bone overlying the SC in patients with SCD syndrome (20 unilateral, 7 bilateral) and in 88 patients without SCD syndrome who had undergone temporal bone CT for evaluation of other otologic disorders (controls). Results--The thickness of bone overlying the SC in the controls measured 0.67±0.38 mm (mean±SD). For individual control subjects, the thickness of bone on one side was correlated with that on the other side (r=0.43; p<0.0001). The thickness of bone overlying the SC on the intact side in patients with unilateral dehiscence measured 0.31±0.23 mm, and was thinner than that noted in the controls (p<0.0001). Conclusions--These findings support the notion that there is a developmental abnormality underlying SCD syndrome. When dehiscence is found on one side, the contralateral side is likely to be thin.
Document Type: Research Article
Affiliations: 1: Laboratory of Vestibular Neurophysiology, Department of Otolaryngology--Head & Neck Surgery The Johns Hopkins University School of Medicine Maryland Baltimore 2: Dr. Noah Weg & Associates The Johns Hopkins University School of Medicine New York Suffern 3: Department of Radiology The Johns Hopkins University School of Medicine Maryland Baltimore
Publication date: 2003-05-01