22q 11 deletion syndrome (22q11DS; Online Mendelian inheritance in man #192430) also known as velocardiofacial or DiGeorge syndrome, is a genetic disorder resulting from a hemizygous microdeletion of the long arm of chromosome 22. It has an estimated prevalence of 1 out of 4000 live births and results in a heterogeneous clinical presentation that is irrespective of deletion size and can be asso...