Abstract
The phenotypic spectrum caused by the microdeletion of chromosome 22q11 region is known to be variable. Nearly all patients with DiGeorge sequence (DGS) and approximately 60% of patients with velocardiofacial syndrome exhibit the deletion. Recent papers have reported various congenital defects in patients with 22q11 deletions. Conversely, some patients have minimal clinical expression. Ten to 25% of parents of patients with DGS exhibit the deletion and are nearly asymptomatic. Two female patients carrying a 22q11 microdeletion and presenting with idiopathic thrombocytopenic purpura are reported. Both had children with typical manifestations of DGS.
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