Pulmonary stenosis with intact ventricular septum: documentation of development of the lesion echocardiographically during fetal life.

We describe a case of severe pulmonary stenosis with intact interventricular septum diagnosed during fetal life at 34 weeks gestational age. An echocardiographic examination had been performed on the same fetus at 20 weeks, when no cardiac anomalies were observed. It is concluded that this form of pulmonary stenosis might be a lesion either acquired during fetal life or becoming progressively more severe in the prenatal period.