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Superior Canal Dehiscence

Superior Canal Dehiscence is when the bony cap over the superior semicircular canal has eroded away and the tough covering (dura) that protects the temporal lobe can make contact with the inner membranes of this canal causing disequilibrium.

Etiology for Superior Canal Dehiscence

Anything that causes increased intracranial pressure such as straining, sneezing, or coughing can exert pressure on the delicate inner ear membranes and cause disequilibrium. This situation can have effects on hearing as well. Loud sounds can cause escape of hydraulic energy through this weak opening and cause disequilibrium. During conduction of sound in the inner ear, there can be escape of hydraulic energy through this weak opening. The result is a conductive hearing loss.