Fig 3.

A, Audiogram of the right superior semicircular canal dehiscence with increased bone conduction (brackets) and decreased air conduction (crosses). The air-bone gap exceeds 10 dB at low sound frequencies (<1 kHz), the range at which acoustic energy is readily dissipated (described in the text). B, Audiogram of left superior semicircular canal dehiscence into the superior petrosal sinus. There is increased bone conduction (brackets) and decreased air conduction (circles), similar to typical SSCCD.