PRIMARY PULMONARY OSTEOSARCOMA IN A DOG

An 11-year-old mixed breed dog was referred because of coughing and pa inful swelling of the distal extremities which had not resolved with a ntibiotic treatment. A consolidated left cranial lung lobe and hypertr ophic osteopathy were identified by radiographs. A unique feature of t his report is the marked, rapid reduction in pain and lameness associa ted with hypertrophic osteopathy after treatment with corticosteroids. Histological examination of an 8 cm diameter, spherical mass found in the excised cranial lung lobe revealed osteosarcoma. No evidence of l ocal or distant metastases was present. The dog survived one year afte r diagnosis.