Pericardial localization of ECD. (A) The histiocytes are positive for CD68 (immunostaining with KP1 clone, original magnification, ×400). (B) Pericardial infiltrate made up of histiocytes, some of them with foamy cytoplasm, admixed with a few lymphocytes (hematein-eosin-saffron, original magnification, ×400)