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Sound- and Pressure-Induced Vertigo Associated with Dehiscence of the Roof of the SuperiorSemicircular CanalGo

Andrew Monga, Laurie A. LoevnerGo,a, David Solomona and Douglas C. Bigelowa

a From the From the Departments of Radiology (L.A.L), Otorhinolaryngology/Head and Neck Surgery (L.A.L., D.S.), Neurology (D.S.), and the University of Pennsylvania School of Medicine (A.M.), University of Pennsylvania Medical Center, Philadelphia, PA.



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  		FIG 1. A 33-year-old woman with sound-induced (Tullio phenomenon) and pressure-induced (Hennebert's sign) vertigo associated with dehiscence of the arcuate eminence (roof) of the superior semicircular canal.

A, 1-mm-thick coronal CT scan through the right temporal bone shows a defect (arrow) in the roof of the superior semicircular canal.

B, 1-mm-thick coronal CT image posterior to A again shows dehiscence (arrow) of the bony roof of the superior semicircular canal.

C and D, Corresponding coronal CT scans of the patient's normal left labyrinth for comparison showing an intact arcuate eminence (arrows).





Copyright © 2009 by the American Society of Neuroradiology. Print ISSN: 0195-6108 Online ISSN: 1936-959X