<prompt> Antischkow cells are -Modified macrophagesModified neutrophilsModified B cellsModified RBCs  <response>: Ans. is a i.e., Modified macrophages Pathologic Features of Acute Rheumatic Fever :-o Aschoff bodies focal inflammatory lesions seen in acute rheumatic fever consisting of foci of T lymphocytes, occasional plasma cells, and plump activated macrophages,o These activated macrophages called Anitschkow cells pathognomonic for Rheumatic Fever have abundant cytoplasm and central round-to- ovoid nuclei occasionally binucleate in which the chromatin condenses into a central, slender, wavy ribbon hence also called caterpillar cells,o Pancarditis - During acute RF, diffuse inflammation and Aschoff bodies may be found in any of the three layers of the heart, resulting in pericarditis, myocarditis, or endocarditiso Verrucae are small 1 to 2 mm vegetations overlying necrotic foci and along the lines of closure of valves,o MacCaUum plaques are irregularly thickened subendocardial lesions usually in the left atrium,o Mitral stenosis - Fish Mouth or Button - Hole stenosis, 