Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is mildly enlarged but unchanged . The mediastinal hilar contours are similar . Pulmonary vasculature is normal . Retrocardiac streaky opacity is not substantially changed , likely atelectasis . No focal consolidation , pleural effusion or pneumothorax is present . Lateral pleural thickening versus extrapleural fat is noted bilaterally , unchanged . Mild degenerative changes are noted in the thoracic spine .
    OUTPUT:
    
Streaky retrocardiac opacity , likely atelectasis . No new focal consolidation to suggest pneumonia .