Re-occlusion of a dehiscence of the superior semicircular canal with increase of the hearing threshold

Introduction With a frequency of 0.6%, patients with vertigo symptoms have an underlying cause of semicircular canal dehiscence (1). For ENT specialists, it is an important differential diagnosis in patients with vestibulocochlear symptoms. The most common diagnosis is dehiscence of the superior semicircular canal. Clinical symptoms can occur in the form of dizziness when performing a Vasalva manoeuvre or when sneezing. It can also be characterised by autophony, pulsating tinnitus, ear pressure and a conductive disorder on the affected side. The dizziness often lasts a few seconds to minutes and is therefore an important differential diagnosis to BPLS. The treatment of choice is a transmastoid occlusion or an occlusion of the round window via the middle cranial fossa.