Prenatal diagnosis of tetralogy of Fallot with absent pulmonary valve accompanied by hydrops fetalis.

Tetralogy of Fallot with absent pulmonary valve is a rare congenital cardiac anomaly. We report on the echocardiographic features of a fetus with such an anomaly and aneurysm of the pulmonary artery associated with hydrops fetalis and polyhydramnios. The prognosis of tetralogy of Fallot with absent pulmonary valve and pulmonary aneurysm is grave, especially in a fetus with intrauterine heart failure. Serial sonographic follow-up is mandatory to detect the signs of hydrops fetalis. Early intervention and intensive treatment should be given to improve the perinatal outcome once the prenatal diagnosis is made.