“…Congenital aneurysmal dilatation of the LA is also considered as a cause of non-rheumatic giant LA, but it was not likely to be the cause of the giant LA in our patient considering his diffusely enlarged LA. However, it should be noted that congenital aneurysmal dilatation of the LA typically involves the atrial appendage but may extremely, rarely arise from the body of the LA [8] . Atrial myocarditis is also a rare but possible etiology…”