More than 20 years have passed since cochlear implantation (CI) was first introduced in Japan. We began CI at the Sapporo Medical University Hospital in 1988; since then, up to the first half of 2015, we have performed CI on 280 ears. In patients aged less than and those aged over 18 years, 121 and 159 ears, respectively, have undergone surgery. This report presents typical cases of CI, such as an adult case, a bilateral case, a case where both hearing and vision were impaired, a pediatric case, a case with multiple handicaps, a case with a genetic mutation leading to severe hearing loss, and a complicated case. In addition, complications with CI cases experienced during extended follow-up periods are also summarized.
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