The thymic – thoracic ratio in fetal heart defects : a simple ratio for identification of fetuses at high risk for microdeletion 22 q 11

diameter measured in the three vessels and trachea view. This ratio was measured in a prospective crosssectional study of 302 normal healthy fetuses between 15 and 39 weeks’ gestation. The study group comprised two groups: one group (CHDn) consisted of 90 fetuses with CHD and a normal karyotype with no del.22q11 and the other group (CHD22) included 20 fetuses with CHD •and a normal karyotype but with proven AQ2