DiGeorge syndrome: 22q11.2 deletion syndrome is a genetic disorder which can result in a vast array of symptoms. Various names have been used to describe different manifestations of the syndrome. Di George Syndrome primarily involves an underdeveloped thymus and parathyroid glands which results in lowered immunity low blood calcium levels respectively. Another primary feature is heart defects. Various other variable features are also present. It is not uncommon for patients to have more than one of the 22q11.2 deletion syndrome subtypes which can make diagnosis confusing - other subtypes include Sphrintzen syndrome, Caylor cardiofacial syndrome and CATCH 22.