High-resolution CT Findings Suggest a Developmental Abnormality Underlying Superior Canal Dehiscence Syndrome

• Published in: Acta oto-laryngologica 2003-05, Vol.123 (4), p.477-481
• Main Authors: Hirvonen, Timo P., Weg, Noah, Zinreich, S. James, Minor, Lloyd B.
• Format: Article
• Language: English
• Subjects: Biological and medical sciences; Case-Control Studies; Ear, auditive nerve, cochleovestibular tract, facial nerve: diseases, semeiology; Female; Humans; Investigative techniques, diagnostic techniques (general aspects); Labyrinth; Labyrinth Diseases - diagnostic imaging; Labyrinth Diseases - physiopathology; Male; Medical sciences; Middle Aged; Non tumoral diseases; Otorhinolaryngology. Stomatology; Otorhinolaryngology. Stomatology. Orbit; Radiodiagnosis. Nmr imagery. Nmr spectrometry; Semicircular Canals - diagnostic imaging; Semicircular Canals - physiopathology; Syndrome; Temporal Bone - abnormalities; Temporal Bone - diagnostic imaging; Tomography, X-Ray Computed
• ISSN: 0001-6489; 1651-2251
• DOI: 10.1080/0036554021000028099

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