Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Moderate enlargement of the cardiac silhouette is re - demonstrated . The aorta is tortuous but unchanged . Mediastinal and hilar contours are similar . Pulmonary vasculature is normal . Minimal patchy opacity is seen in the retrocardiac region . No focal consolidation , pleural effusion or pneumothorax is present . Moderate multilevel degenerative changes are seen in the thoracic spine . Gastric lap band is incompletely imaged .
    OUTPUT:
    
Patchy opacity in the retrocardiac region most likely reflective of atelectasis . Infection is not completely excluded .