Semicircular canal dehiscence

In the evaluation of patients with suspected superior (or posterior or lateral) semicircular canal dehiscence syndrome, imaging plays a crucial corroborative diagnostic role. The variable audiologic and vestibular signs and symptoms may be attributed to a third-window phenomenon, directly visible on computed tomography as a defect in the superior or posterior semicircular canals. While the diagnosis must incorporate computed tomography findings with the signs, symptoms, and clinical testing, imaging also provides anatomical information on dehiscence size and location that may help explain the specific clinical presentation and aid in surgical planning.