Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is mildly enlarged . The aorta is tortuous . Mediastinal and hilar contours are otherwise unremarkable . Pulmonary vasculature is not engorged . Minimal patchy opacities are noted in the lung bases which likely reflect areas of atelectasis . No focal consolidation , pneumothorax , or pleural effusion is present . Moderate multilevel degenerative changes are seen in the imaged thoracic spine .
    OUTPUT:
    
Patchy opacities in the lung bases , likely atelectasis .