Endocardial fibroelastosis was first described by Weinberg and Himmelfarb in 1943 as a thick subendocardial layer of connective tissue and elastin, encapsulating the underlying myocardium of the left atrium and left ventricle.
This is a companion discussion topic for the original article at https://patient.info/doctor/congenital-disorders/endocardial-fibroelastosis