Do Filling Defects of the Vestibule Represent a Neuroradiological Marker for Congenital Cytomegalovirus? A Retrospective Case Series

Abstract

Introduction: The aim of this study was to investigate whether radiological marker(s) of the inner ear can be detected in congenital cytomegalovirus (cCMV) patients with severe-profound sensorineural hearing loss.

Methods: A retrospective imaging review of confirmed cCMV paediatric patients that had undergone consecutive cochlear implantation was performed at a tertiary hospital. Available pre- and postoperative imaging was examined, and abnormalities of the labyrinth were catalogued by a consultant neuroradiologist in the study group and control group.

Results: Twenty-eight paediatric patients with cCMV having undergone cochlear implantation were identified between the ages of 1-15 years (mean 4.7 years) at the time of implantation. Increased density of the vestibule on computed tomography (CT) or filling defects of the vestibule on magnetic resonance imaging (MRI) were identified in 11 and 4 patients, respectively, of the 24 in the case series. No filling defects were identified in any of the 48 CT and MRI control group.

Conclusion: This study demonstrates a potential novel radiological finding of the inner ear of patients with cCMV. With more research, greater onus placed on MRI and CT for inner ear assessment may facilitate early detection and treatment for patients at risk of significant hearing loss. Further prospective studies in this area will help to validate radiological markers in order to establish a comprehensive inner ear classification system for neuroradiological features in cCMV.

Keywords: Computed tomography; Cytomegalovirus; Inner ear; Magnetic resonance imaging; Vestibule.