Double Infarct Histology. Histologic section of a dog LV 32 days following the first (LAD), and 4 days after second (LCx), MI. (A) Acute (LCx) MI with coagulation necrosis, inflammation and multiple foci of calcification (40×, Masson's trichrome). (B) Same area at higher magnification. Dying myocardial fibers (white arrow) associated with inflammatory cells, Calcium precipitates (white arrowhead) (100×). (C) Late subacute (LAD) MI in the same heart with granulation tissue (white arrowhead) and early collagen deposition, interdigitating (white arrow) with viable myofibers (40×, Masson's trichrome).