Abstract
The 22q11.2 microdeletion syndrome (SD22q11.2) is the most prevalent microdeletion syndrome, consisting usually in heterozygous loss of 3 megabase (Mb) of the chromosse 22 long arm. Its prevalence varies from 1 in 5950 to 1 in 4000 live births. The main organs affected are embryonic derived from the third and fourth gill arches: head and neck muscles and bones, parathyroid glands, thymus …