Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient is status post median sternotomy and CABG . Moderate enlargement of the cardiac silhouette is unchanged . The thoracic aorta is diffusely calcified and tortuous , as seen previously . Mild pulmonary vascular congestion is present . Focal opacity in the left mid lung field is concerning for pneumonia . There appears to be possible trace bilateral pleural effusions . No displaced fractures are evident . There are mild degenerative changes noted in the thoracic spine .
    OUTPUT:
    
Focal opacity in the left mid lung field is concerning for pneumonia . Mild pulmonary vascular congestion and probable trace bilateral pleural effusions .