Any familial isolated dilated cardiomyopathy in which the cause of the disease is a mutation in the ACTN2 gene. The disease is Monarch Disease Ontology id MONDO_0012808 (dilated cardiomyopathy 1AA). Also known as: ACTN2 familial isolated dilated cardiomyopathy, CMD1AA, cardiomyopathy, dilated, 1AA, with or without LVNC, cardiomyopathy, hypertrophic, 23, with or without LVNC, dilated cardiomyopathy 1AA with or without left ventricular noncompaction, dilated cardiomyopathy type 1AA, familial isolated dilated cardiomyopathy caused by mutation in ACTN2.