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Atrial thrombosis in a Syrian hamster.
The atrium is expanded by a large luminal thrombus that is regionally adherent to the endocardium. The thrombus is composed of laminated layers of fibrin, leukocytes, and erythrocytes, and intermixed hemosiderin-laden macrophages.
(Photo Courtesy of J. Landolfi, University of Illinois Zoological Pathology Program)
