Prenatal Diagnosis of Isolated Tricuspid Valve Atresia

OBJECTIVE: To describe the prenatal features of fetal tricuspid atresia. METHODS: Four cases of fetal tricuspid atresia were prenatally diagnosed, sonographically described, and followed. RESULTS: On the basis of this small series, the key findings for diagnosis included the demonstration of no patent tricuspid valve on the 4-chamber view, no flow across the tricuspid valve on pulsed or color Doppler flow mapping, small right ventricles, and associated interventricular septal defects. Increased nuchal translucency thickness may give the first clue leading to follow-up scans, resulting in a definite diagnosis. CONCLUSIONS: Tricuspid atresia can be readily diagnosed prenatally. The key findings and differential diagnoses are provided.