Hypertrophic Osteopathy Secondary to Esophageal Osteosarcoma in a Dog
World Small Animal Veterinary Association World Congress Proceedings, 2009
C.N. Pimenta; R.A. Carneiro; G.E. Lavalle; L.C. Pereira; G.A.O. Cavalcanti
Veterinary School, Federal University of Minas Gerais, Minas Gerais, Brazil

A seven year old Dobermann dog breed was brought to the Federal University of Minas Gerais Veterinarian Hospital with symptoms such as vomits, claudication, sensibility and enlargement of the four limbs which were firm on touch. The animal was X-rayed after clinical evaluation and blood extraction. The X-ray showed bilaterally symmetrical periosteal proliferation of the radius and ulna. The thoracic x-ray revealed an increased volume in the mediastinum region. Pulmonary neoplasm and hypertrophic osteopathy were suspected. A regenerative anemia was detected by the hemogram. The animal was medicated with antibiotic, anabolic, H2 inhibitory and antiinflammatory prior surgery. The surgical access was done through the seventh intercostal interval. The thoracic esophagus showed an increased volume of 8 x 6 x 4cm and partial atelectasis of the medium and diaphragmatic pulmonary lobes were observed. The total extirpation of the volume was done with the loss of approximately 12cm of the dorsal esophagus wall. A fragment of bovine pericardium preserved in glycerin 98% was used to correct the esophagus crack. During the late post-surgery the animal showed regurgitation events. New X-ray evaluations were done but esophagus stenosis, megaesophagus or other pathology that justify the symptoms described were not observed. The histopathological result of the tumor located on the esophageal wall showed an osteoblastic osteosarcoma that could have happened, according to some authors, as a consequence of Spirocerca lupi infestation leading to pulmonary metastasis and, less frequently, hypertrophic osteopathy. Fifty days later the animal showed accentuated deterioration of its clinical condition, presenting pain on the limbs and inability to walk. Its owner opted for the euthanasia. The necropsy findings revealed an esophagus macroscopically normal, nodules of varying size (2 to 5mm of diameter) scattered thought out the lung, pleuritis in final resolution stage and thickening of the long bones. The metastasis in the pulmonary parenchyma was responsible for the non-regression of the bone lesions of hypertrophic osteopathy. The bovine pericardium graft showed total tissue integration and the demarcation line between donor and receiver was not macroscopically observed.

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C.N. Pimenta
Veterinary School
Federal University of Minas Gerais
Minas Gerais, Brazil

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