abnormal myocardium compact layer morphology MP:0004056 MP:0010550 MPheno.ontology Note that the synonyms "subepicardium layer" and "subepicardial layer" are used in older literature to refer to the myocardium compact layer. abnormal compact subepicardial layer morphology abnormal compact subepicardial myocardium morphology abnormal heart compact layer abnormal myocardial compact layer morphology abnormal subepicardial layer morphology abnormal subepicardium layer morphology abnormal subepicardium morphology any structural anomaly of the outer, dense layer of the myocardium uniting the epicardium and myocardium abnormal myocardium layer morphology