cardiomyopathy, familial restrictive, 3 (MONDO_0012900) is any familial isolated restrictive cardiomyopathy in which the cause of the disease is a mutation in the TNNT2 gene. Also known as: TNNT2 familial isolated restrictive cardiomyopathy, cardiomyopathy, familial restrictive, type 3, familial isolated restrictive cardiomyopathy caused by mutation in TNNT2.