Congenital polycystic tumor of the atrioventricular node.
D001283:Atrioventricular Node / Q000002:abnormalities*; D003560:Cysts / Q000151:congenital*; D006329:Heart Conduction System / Q000002:abnormalities*; D006330:Heart Defects, Congenital / Q000473:pathology; D006338:Heart Neoplasms / Q000151:congenital*; D006801:Humans