Diagnosis of left juxtaposition of the atrial appendages in the fetus.

We describe two cases of left juxtaposition of the atrial appendages in which fetal echocardiograms provided a clue to the diagnosis. Both cases were associated with complex cyanotic congenital heart disease. The clue to the diagnosis was found at the three-vessel view. Abnormal vascular spaces were seen on the left side of the cross-sections of the great arterial trunks.