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Aortic valvular endocarditis, horse. This equine (horse) aorta has been dissected at the level of the valve, separating the artery from the left ventricle (bottom chamber). Nodules are present which have formed as a consequence of endocarditis. . Michael Frank, Royal Veterinary College. Attribution-NonCommercial 4.0 International (CC BY-NC 4.0). Source: Wellcome Collection.