now-a-days truncus arteriosus has been known as “common arterial trunk†(cat) and is an uncommon congenital cardiac defect presenting in about 1-3% congenital heart disease. environmental and genetic factors effects on incidence of cat and other conotruncal anomalies. the majority patients with cat and 22q11 deletion have other anomalies such as hypoplasia or aplasia of the thymus or parath...
