9 year old Labrador Retriever

Findings

The cardiac silhouette is moderately enlarged with left atrial enlargement causing dorsal and lateral displacement of the principal bronchi. There is a broad based soft tissue opacity bulge effacing the cranial cardiac silhouette which appears to be confluent with the heart. There is a bulge in the left cardiac silhouette in the position of the left auricle. The pulmonary parenchyma is normal. No other abnormalities are noted.