Dehiscence or Thinning of Bone Overlying the Superior Semicircular Canal in a Temporal Bone Survey

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Abstract
MINOR et al1 identified a syndrome related to dehiscence of bone overlying the superior semicircular canal. Vertigo, oscillopsia, and/or dysequilibrium resulted from sound, changes in middle ear pressure, and/or changes in intracranial pressure in these patients. Vertical-torsional eye movements were induced by these sound and pressure stimuli and documented by measurement of the eye movements in 3 dimensions. Ultra–high-resolution computed tomographic (CT) scans of the temporal bone demonstrated dehiscence of the bone overlying the affected superior semicircular canal. The dehiscence has been confirmed in surgical explorations of the middle cranial fossa, with plugging or resurfacing of the defect in 5 cases.