47,XX,+21; 47,XY,+21; Trisomy 21 

Hearing impairment or deafness is decreased or absent ability to perceive auditory information. While some cases of hearing loss are reversible with medical treatment, many lead to a permanent disability. Of vital importance are the age at which the hearing loss occurred, as this may interfere with the acquisition of spoken language. Hearing aids and cochlear implants may alleviate some of the barriers caused by hearing impairment, but are often insufficient. ...

A disorder caused by the presence of an extra chromosome 21 and characterized by mental retardation and distinguishing physical features.

Hearing Loss as related to Down Syndrome