Superior semicircular canal dehiscence (SSCD) is a rare entity recently described whose typical clinical symptomatology is represented by dizziness triggered by a variation of pressure. We reported a case of SSCD which was diagnosed thanks to computed tomography (CT) scan of the petrous bone conducted systematically in front of mixed deafness with normal eardrum. The SSCD was bilateral and was revealed by mixed deafness on the left side and perception deafness on the right with a normal eardrum without the notion of vertigo. The cervical vestibular evoked myogenic potential (cVEMP) and an ultra-high resolution CT scan of the petrous bones in coronal and sagittal sections allowed the diagnosis. The SSCD should be considered in the presence of any conductive or mixed hearing loss with a normal eardrum. The CT scan in coronal and sagittal submillimetric sections allows the diagnosis.
La maladie de Horton est une artérite giganto-cellulaire touchant les artères de gros et de moyen calibre du territoire céphalique. Elle a une expression clinico-biologique polymorphe. Le diagnostic de certitude est posé devant des formes typiques comportant des critères diagnostiques cliniques et paracliniques établis par l'ACR (American College of Rhumatology). Cependant certaines formes atypiques de la maladie peuvent faire retarder le diagnostic, c'est le cas notamment des formes révélées par des manifestations ORL qui sont inhabituelles et peu spécifiques. Le but de ce travail est de rapporter un cas atypique de la maladie de Horton révélé par des acouphènes, le retard diagnostique pouvant être à l'origine d'une mauvaise prise en charge thérapeutique, avec des risques de complications vasculaires graves.
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