Congenital cytomegalovirus (cCMV) infection is a common cause of sensorineural hearing loss (SNHL). The incidence of SNHL is higher in symptomatic cCMV infants and is usually identified early. By contrast, the incidence of SNHL is lower in children with asymptomatic cCMV, and the hearing loss can be delayed in onset and progressive. The objective was to compare the outcome of cochlear implantation in children deafened by cCMV with a control group of children with implants who do not have the condition.