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[Left superior vena cava drainage to the coronary sinus. Fetal cardiac doppler].

We report a fetus of 35 weeks gestation in which a continuous flow was detected in the lower portion of the right atrium with a peak velocity of 0.8 m/s. After delivery the echo-doppler study showed a dilated coronary sinus in the long axis parasternal view, and a bilateral superior vena cava in the short axis suprasternal notch view. Comments about the cause of this anomalous continuous flow are discussed.