<prompt> Mac Callum plaques in rheumatic hea disease areLeft atriumLeft ventricleRight atriumRight ventricle  <response>: Mac Callums plaques is a condition featuring the thickening of left atriums wall and its endocardial wall above the mitral valve due to fibrosis. It is one complication of chronic rheumatic hea disease. Other complications of chronic rheumatic hea disease are valvular effect stenosis, insufficiency or can be both, valvular leaflets become thickened by fibrosis, frequent valvular calcification, cordae tendinae become thickened, shoened and fused. Robbins 9 th edition page 393 