A stenosis of the isthmus aortae concurrent with multiple defects in a calf heart. An attempt at an embryological and phylogenetic explanation.

The findings in a calf heart with multiple ventricular septum defects and an isthmus stenosis in an aorta with its origin in the right ventricle have been described and discussed. The anomalies are explained embryogenetically as well as phylogenetically. No choice could be made between the theories. The author states: The phylogenetic theory needs more attention in future comparative studies of anomalies of the heart.