Mc Callum's patch is diagnostic of-
High-Yield Explanation
Mac Callum's plaques is a condition featuring the thickening of left atrium's 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 no. 393