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Absence of the left ventricular myocardium in a newborn

Summary Absence of myocardial fibers in the right ventricle is the essence of so-called Uhl's anomaly, which should be distinguished from the fatty replacement producing arrhythmogenic right ventricular dysplasia of the adolescent and young adult. In this report, we describe a newborn with nearly complete absence of the myocardium of the left ventricle. The infant died on the seventh day because of myocardial incompetence of the left ventricle, which was unable to open the aortic valve.