12 year old Border Collie

Discussion

Pulmonary bullae are occasional incidental findings on thoracic radiographs. They are thin-walled and often multiple, with distribution in many lung lobes. Thinner-walled lesions would be more compatible with emphysema, and thick or irregularly walled lesions are more likely to be infectious, neoplastic or parasitic in origin. Any bullous lesion can rupture and cause pneumothorax.