TY - CHAP M1 - Book, Section TI - The Temporal Bone and Ear A1 - Wells, Robert G. Y1 - 2015 N1 - T2 - Diagnostic Imaging of Infants and Children AB - There are various classification techniques for hearing loss in children. Congenital (prelingual) hearing loss occurs before the child learns to speak. The prevalence of congenital hearing loss is 1 to 3 per 1,000 livebirths. Approximately 0.1% of children in the United States are born with profound deafness. The prevalence of late-onset (postlingual) hearing loss is about half of that of the prelingual form. About half of pediatric hearing loss is due to genetic factors, one-quarter of patients have acquired lesions, and one-quarter have idiopathic hearing loss. Seventy percent to 80% of instances of genetic deafness are nonsyndromic, that is, no associated anomalies in other parts of the body. Most patients with nonsyndromic deafness have abnormalities of the inner ear, that is, sensorineural deafness. Conductive hearing loss is due to abnormalities of the middle ear. If both sites are involved, the hearing loss is mixed.1–3 SN - PB - McGraw-Hill Education CY - New York, NY Y2 - 2024/03/28 UR - accesspediatrics.mhmedical.com/content.aspx?aid=1148945187 ER -