Heart, dog, case No. 2. Two micrographs depicting the same, severe atherosclerotic lesion of a coronary artery (2a - lower magnification, 2b - higher magnification). A major section of the arterial wall has been replaced and distorted by acicular cholesterol clefts (arrows). Inflammatory cells, mostly consisting of lipid laden histiocytes (asterisk) are visible within the arterial wall.