Regression of hypertrophic osteopathy following pneumonectomy in a dog.

Hypertrophic osteopathy was diagnosed clinically and radiographically in a 6-year-old English Bulldog. Pneumonectomy to remove a primary pulmonary fibrosarcoma resulted in rapid regression of clinical signs and soft tissue enlargement of the limbs and gradual but incomplete regression of periosteal new bone formation over a 15-month postoperative course.