Superior Semicircular Canal Dehiscence – An Otologic Impersonator

• Main Author: Carção, André
• Publication Date: 2021
• Other Authors: Costa, Joana Borges, Abreu Pereira, Diogo, Duarte, Delfim, Neves, Marta, Azevedo, Paula
• Format: Article
• Language: por
• Source: Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
• Download full: https://doi.org/10.34631/sporl.820
• topic: Dehiscence; Superior Semicircular Canal; Audiogram; Acoustic Reflexes; Deiscência; Canal Semicircular Superior; Audiograma; Impedanciometria

Objectives: to identify common clinical characteristics in patients with superior semicircular canal dehiscence (SSCD)in order to increase the diagnostic suspicion of this recently described clinical entity. Materials and Methods: a retrospective analysis was carried out between 2016 and 2019 and 5 cases were analyzed, corresponding to 8 ears with SSCD, analyzing the accompanying symptoms. The diagnosis of dehiscence was established through computed tomography (CT) of the temporal bone. Results: Hearing loss was the major complaint being common to all patients. In the 8 ears analyzed, there was a predominance of conduction hearing loss in frequencies below 1000Hz with normal impedance audiometry. Conclusions: the recognition of these patients, with a third non-physiological window in the bony lining of the superior semicircular canal, makes possible a differential diagnosis that explains a conduction or mixed hearing loss with acoustic reflexes present, thus preventing errors in diagnosis and unnecessary surgery.