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Chronic hemorrhage with hemosiderin. Tissue aspirate. Dog.
Several foamy macrophages are present in this follicular cyst lesion. The macrophage directly below the cholesterol crystal contains blue-green granular material the cytoplasm consistent with hemosiderin, a breakdown product of erythrocytes. On the left edge is a macrophage with large black granules suggestive of hemosiderin. (Wright; HP oil.)
