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Hematoxylin and eosin staining (× 400). (A) Hemangiosarcoma (HSA) showing polygonal tumor cells with some areas of vascular clefts or channels in Case 10. (B) HSA in Case 9. (C) HSA showing some polygonal tumor cells. Red blood cells were observed in vascular clefts or channels in Case 5. Bar, 60 µm.
