abnormal cardiovascular system physiology abnormal susceptibility to aortic cartilaginous metaplasia 2014-04-28T00:00:00Z MP:0020092 MPheno.ontology an anomaly in the susceptibility to the transformation of cells comprising the aorta epithelium to arterial chondrocytes that express type II collagen, resulting in heterotopic formation of cartilage and may lead to calcification in the aorta nvasilevsky