Mesothelioma (coelothelioma) of the atrioventricular node.
D001283:Atrioventricular Node / Q000473:pathology; D006338:Heart Neoplasms / Q000175:diagnosis / Q000473:pathology*; D006801:Humans; D008297:Male; D008654:Mesothelioma / Q000175:diagnosis / Q000473:pathology*; D008875:Middle Aged