[Superoinferior ventricles].

We describe two patients with under-and-over ventricles. Both were diagnosed angiographically. One has atrial, situs solitus with discordant atrioventricular and ventriculoarterial connections and a ventricular septal defect. The second has atrial situs inversus with concordant atrioventricular connections and double-outlet right ventricle. We review the literature and analyze the probable embryogenesis of the malformation.