abnormal fetal atrioventricular canal morphology abnormal fetal atrioventricular canal septation 2010-10-06T09:58:37Z MP:0010599 MPheno.ontology abnormal partitioning of the atrioventricular canal anomaly in the process by which the dorsal and ventral endocardial cushions develop in the walls of the common atrioventricular canal, grow toward each other and fuse, dividing the common atrioventricular canal into right and left atrioventricular canals and the atrioventricular septum csmith