Two-dimensional real-time echocardiographic examination of a 3-year-old Thoroughbred gelding with pleuropneumonia revealed an intact aneurysm of the right sinus of Valsalva, which was confirmed at postmortem examination. The horse had no clinical signs associated with the aneurysm.
Department of Clinical Studies, Section of Medicine, New Bolton Center, School of Veterinary Medicine, University of Pennsylvania, Kennett Square 19348.