persistent atrioventricular canal

per·sis·tent a·tri·o·ven·tric·u·lar ca·nal

a condition that is caused when the atrial and ventricular septa fail to meet, as in normal development, resulting in a low atrial and a high ventricular septal defect or a common atrioventricular canal. Synonym(s): endocardial cushion defect