Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is normal in size . The mediastinal and hilar contours appear within normal limits . There is no pleural effusion or pneumothorax . There is mild elevation of the left hemidiaphragm compared to before with persistent streaky opacity , not significantly changed and suggesting minor scarring . There is no definite evidence of pneumonia . The bony structures appear within normal limits .
    OUTPUT:
    
Findings suggesting minor atelectasis at the left lung base , but otherwise unremarkable .