12 year old Labrador Retriever

Findings

There is a large, central to left sided soft tissue mass dorsal to the cardiac silhouette that is causing dorsal deviation and narrowing of the mid thoracic esophagus, ventral displacement of the heart and caudal trachea and abaxial displacement and attenuation of the caudal mainstem bronchi. A heavy bronchointerstitial pattern is seen radiating into the surrounding lung lobes and appears to involve both sides of the thorax. Patchy alveolar infiltrates are also present in the right middle lung lobe. There are pleural fissure lines in both hemithoraces. The cranial mediastinum is widened. The esophagus is gas distended along its length. The cardiovascular structures are poorly visualized but appear to be within normal limits.