IHY Ng, WWL Lo, SSW Cheng, IFM Lo

Case History

The proband is a 5-year-old boy born full term to non-consanguineous Chinese parents. He was referred to clinical genetic service for pre-lingual onset bilateral mild to moderate hearing loss (Figure 1). He had no dysmorphic features, and the morphology of his ears was normal. He had no developmental delay. His elder brother also had right severe hearing loss and left mild high-frequency hearing loss with pre-lingual onset (Figure 1). His brother was non-syndromic, and was put on hearing aids. He had normal development except mild speech delay and articulation problem. His parents had normal hearing (Figure 1). No significant family history of hearing loss was known.

Figure 1 Pedigree of the family.

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