[The study of detection and etiology of unilateral deafness in children].

To explore the detection approach and aetiology of single-side deafness(SSD) in children and provide evidence for diagnoses and treatment. A retrospective study was performed. Medical history and radiological data of children with unilateral deafness were analyzed. The mean age at diagnosis was 6 years old. The mean age at diagnosis was 7.7 month because of failure of universal newborn hearing screening. Inner ear malformations were identified in 80.6% of cases. Cochlear nerve deficiency(CND) was observed in almost 77.8% of our cases, accounts for 96.6% in children with inner ear malformations. The children with SSD could be early detected by UNHS. CND is the main aetiology for SSD. MRI should be the first image choice when SSD children was diagnosed.