Mc Callum's patch is diagnostic of:
Rheumatic hea disease is one of the forms of vegetative valve disease, each of which exhibit their own characteristic morphologic features. Subendocardial lesions, perhaps excerbated by regurgitant jets, can induce irregular thickening called MacCallum plaques,usually in the left atrium.
Infective endocarditis
Rheumatic endocarditis
Myocardial infarction
Tetralogy of Fallot (ToF)
Rheumatic Fever