BackgroundHeartfailureisoneofthemaincausesofdeathduetoprogressivemusculardystrophyofDuchennemusculardystrophy(DMD)inthemajorityofthecases.ThereishighincidenceofarterialthromboembolisminDMDpatientswithsevereheartfailure.However,ithasbeenreceivinglittleattentionwhetheranticoagulativetherapyinDMDpatientswithsevereheartfailureinsinusrhythmshouldbeperformed.HereinwepresentacaseofDMDpatients,withsevereheartfailureinsinusrhythm,whopresentsalargemuralthrombusformationatleftventricularanteriorwall.