Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is moderate enlargement of the cardiac silhouette . The aorta demonstrates mild tortuosity and vascular calcifications . The pulmonary vascularity is not engorged . Except for minimal atelectasis in the retrocardiac region , the lungs are clear without focal consolidation . No pleural effusion or pneumothorax is identified . Mild degenerative changes of the thoracic spine are present .
    OUTPUT:
    
Minimal retrocardiac atelectasis , without evidence of pneumonia .