The thin, smooth membrane that lines the inside of the chambers of the heart and forms the surface of the valves.
- Only rarely does it involve the endocardium or cardiac valves.
- The pericardium, cardiac valves, endocardium, and coronary arteries were normal.
- The endocardium showed prominent endocardial fibroelastosis, particularly in sections obtained from the right side of the heart.
Late 19th century: modern Latin, from endo- 'within' + Greek kardia 'heart'.
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