Is there another type of biventricular atrioventricular connection?

In evaluating a 9-year-oid girl, we encountered the following cardiac anoma lies: a left atrioventricular valve (the morphologic left atrium on the lef t side, connected with the morphologic left ventricle); concordant atrioven tricular connections; a right atrioventricular valve (a morphologic right a trium on the right side, connected with the morphologic right ventricle); c oncordant atrioventricular connection; a "central" atrioventricular valve ( separating the morphologic right atrium from the morphologic left ventricle ); and discordant atrioventricular connection with intact interatrial and i nterventricular septa. A right-to-left shunt passed through the central val vular structure, which was situated at the atrioventricular septum. This wa s the only means of mixing pulmonary and systemic blood. We suggest that this case presents a newly recognized cardiac anomaly.