DOI: http://dx.doi.org/10.18203/issn.2454-5929.ijohns20221030

Asymptomatic unilateral lateral semicircular canal aplasia associated with a dilated vestibule

Nuno Medeiros, Pedro Valente, Artur Condé, João Larangeiro

Abstract


Lateral semicircular canal aplasia is a rare form of vestibular dysplasia. This is the last canal to be formed during the fetal period, becoming susceptible to isolated malformations. A 17-year-old male patient performed a magnetic resonance with a subsequent incidental finding of isolated, unilateral, lateral SCS aplasia associated with a dilated vestibule. He was asymptomatic and physical examination was unremarkable. Videonistagmography showed a diminished ipsilateral caloric response and ipsilateral v-HIT gains were normal. To the best of our knowledge, this is the first non-syndromic case of aplasia of the lateral SCS with no vestibular or audiological symptoms. This absence could be explained by compensation due to the congenital nature of this malformation.

 


Keywords


Aplasia, Semicircular canal, Congenital

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