Early prenatal diagnosis of tricuspid stenosis.

Although the prenatal diagnosis of heart anomalies has improved dramatically during the last 2 decades, the diagnosis of heart anomalies remains a challenge. Tricuspid stenosis has not been previously diagnosed in the early second trimester. The sonographic signs of early detection of tricuspid stenosis at 15 weeks of gestation included normal sized right atrium, small right ventricle, narrow pulmonary artery, and diminished flow through the tricuspid valve. The diagnosis was confirmed by postabortal examination. In this case report we describe, for the first time, early prenatal diagnosis of tricuspid stenosis at 15 weeks' gestational age.