Idiopathic dilated cardiomyopathy is a primary myocardial disease which is
characterised by left ventricular, or biventricular, dilatation and impaire
d contractility. The precise aetiology is unknown and the relative contribu
tion of genetic and environmental factors is debated. We report two identic
al male twins of Caucasian origin with idiopathic dilated cardiomyopathy wh
o presented within a few months of each other.