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Although central nervous system abnormalities are incidentally detected in preoperative brain magnetic resonance imaging (MRI) studies in pediatric cochlear implant (CI) candidates, the clinical significance of the abnormalities remains unclear. We aimed to assess post-implantation auditory and speech performance in patients with brain lesions seen on MRI. Pediatric CI recipients (n = 177) who underwent preoperative MRI scans of the brain between January 2002 and June 2009 were included in this study. Patients with brain lesions on MRI were reviewed and categorized into the following groups: brain parenchymal lesions (focal vs. diffuse), ventriculomegaly, and extra-axial lesion. The main communication mode as well as progress in auditory perception and speech production were evaluated preoperatively and at 3, 6, 12, and 24 months postoperatively. Performance in patients with brain lesions was compared with the age- and sex-matched control group. Various brain lesions were found in 27 out of 177 patients. Children with brain lesions who received CIs showed gradual progress in auditory and speech outcomes for 2 years, though performance was reduced compared with the control group. In addition, there was a significant difference in the main communication mode between the two groups at 2 years following cochlear implantation. This difference was especially significant in patients with diffuse brain parenchymal lesions after further stratification of the brain lesion group. Preoperative brain MRI may have a role in improving the prediction of adverse outcomes in pediatric CI recipients. In particular, children with diffuse brain parenchymal lesions should be counseled regarding the poor prognosis preoperatively, and followed up with special attention.

The Clinical Significance of Preoperative Brain Magnetic Resonance Imaging in Pediatric Cochlear Implant Recipients