<unk>  is characterized by a thickening of the innermost lining of the heart chambers (the endocardium) due to an increase in the amount of supporting connective tissue and elastic fibres. It is an uncommon cause of unexplained heart failure in infants and children, and is one component of HEC syndrome.<unk>  is strongly seen as a primary cause of restrictive cardiomyopathy in children, along with cardiac amyloidosis, which is more commonly seen in progressive multiple myeloma patients and the elderly.
Endocardial fibroelastosis
Acrokeratoelastoidosis of Costa
Amyloid cardiomyopathy
Arteriosclerosis obliterans
Idiopathic giant-cell myocarditis
Coronary artery aneurysm
Eosinophilic myocarditis
Cardiac fibroma