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Septic Pericarditis, Aortic Endarteritis, and Osteomyelitis in a Dog

From the Departments of Small Animal Medicine and Surgery (Peterson, Miller, Henry) and Veterinary Pathobiology (Hansen), College of Veterinary Medicine, Texas A&M University, College Station, Texas 77843-4474.

Address all correspondence to Dr. Peterson.

A 7-year-old, female spayed rottweiler was referred with a history of an acute onset of collapse attributable to cardiac tamponade. Thoracic radiographs revealed an enlarged cardiac silhouette compatible with pericardial effusion, sternal osteomyelitis, and an unusual mineralized lesion determined later to be within the aortic wall. The pericardial effusion was a septic exudate secondary to infection with Staphylococcus species and hemorrhage into the pericardium through a mineralized aortic lesion. The case demonstrates the importance of complete evaluation of thoracic radiographs in a patient with cardiac disease and the potential value of cytopathologicalevaluation of pericardial fluid.