abnormal outflow tract development abnormal conotruncus morphology abnormal conotruncal ridge morphology 2010-10-05T02:18:13Z MP:0010585 MPheno.ontology abnormal aortico-pulmonary spiral ridges abnormal bulbar ridge morphology abnormal conotruncal cushion morphology abnormal conotruncal cushions abnormal conotruncal ridges abnormal endocardial ridges abnormal outflow tract cushion morphology abnormal outflow tract endocardial cushion morphology any structural anomaly of the pair of spiral mesenchymal swellings in the primordial ventricular outflow tract, that eventually fuse to form the conotruncal septum, dividing the subvalvular outflow tract and contributing to the membranous interventricular septum csmith