Hypertrophic osteopathy in a dog with a chronic lung abscess.

A 2-year-old dog was examined because of gradual lameness of all 4 limbs and weight loss. Hypertrophic osteopathy was diagnosed. Radiography revealed a mass in the caudal lobe of the right lung. At necropsy, the mass was determined to be a chronic abscess. Corynebacterium pyogenes was cultured from the lesion. Although hypertrophic osteopathy in dogs is commonly associated with a thoracic lesion, most often neoplastic, the chronic lung abscess in this dog might have been formed as a result of a paralaryngeal abscess that was treated 3 months before the onset of the lameness.