Abstract

PRENATAL DIAGNOSIS OF TETRALOGY OF FALLOT

Sameer Sable*, Y. P. Sachdev, Ganesh Vikhe and Rachana Sabale

ABSTRACT

(1) To emphasize the findings of tetralogy of Fallot (TOF) using ultrasound in fetus. Five fetuses with TOF were prenatally diagnosed at gestational ages of 21 weeks, 28 weeks, 20 weeks, 23 weeks and 20 weeks. Based on this small series, prenatal ultrasonographic findings suggesting TOF can be summarized as follows: (1) small pulmonary artery, (2) perimembranous VSD (ventricular septal defect), (3) overriding aorta, (4) dilated ascending aorta and (5) right ventricular hypertrophy. TOF can be confused with pulmonary atresia (PA) with VSD and double outlet right ventricle (DORV). However careful examination reveals no antegrade flow in pulmonary artery in PA with VSD and parallel orientation of great vessels and overriding pulmonary artery in DORV. Tetralogy of Fallot is characterized by a subaortic ventricular septal defect, an aortic root that overrides the VSD and pulmonary infundibular stenosis. Right ventricular hypertrophy, which represents the fourth anatomic feature of TOF, is not usually seen prenatally.[1] The objective of this report was to focus on the sonographic findings of TOF during the prenatal period.

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