Fetal Pulmonic Stenosis and Tricuspid Regurgitation on Ultrasound Right atrium is most dilated. The fetus has severe pulmonary stenosis as well as severe tricuspid regurgitation. Dr. Howard T Heller MD FAIUM @hellersound #Fetal #Pulmonic #Stenosis #Tricuspid #Regurgitation #Ultrasound #POCUS #obgyn #obstetrics #clinical