Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is moderately enlarged . The mediastinal and hilar contours are normal . Pulmonary vasculature is not engorged . No focal consolidation , pleural effusion or pneumothorax is present . Minimal streaky retrocardiac opacity likely reflects atelectasis . There are mild degenerative changes demonstrated in the thoracic spine .
    OUTPUT:
    
Retrocardiac atelectasis . Moderate cardiomegaly without evidence of congestive heart failure .