Absent pulmonary valve syndrome (APVS) is a variant of Tetralogy of Fallot (TOF). It shares the features of the classical form of TOF with
the addition of incompetent or absent pulmonary valve. It is associated with severe dilatation of the main and branch pulmonary arteries because of concurrent severe pulmonary stenosis and regurgitation
Keywords: absent pulmonary valve syndrome, tetralogy of Fallot, chromosome abnormality, 22q 11 micro deletion, prenatal diagnosis, fetal outcomes.