Hypertrophic osteopathy associated with Mycobacterium fortuitum pneumonia in a dog

Mycobacterium fortuitum was isolated from the lung of a dog that had new periosteal bone formation consistent with hypertrophic osteopathy. Fever, weight loss, and bilateral hind limb lameness were the initial clinical signs. The tarsi were swollen and a pain response was elicited on palpation of the hind limb. Radiography revealed periosteal new bone formation on the metatarsi, femurs, and ischii. Thoracic radiography revealed pulmonary mass lesions in the right middle and left caudal lung lobes. After right middle and left caudal lung lobectomy, M fortuitum was isolated from the excised tissues. Amoxicillin trihydrate/clavulanic acid and amikacin were administered, on the basis of susceptibility test results.