Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: No significant interval change . No focal consolidation , effusion , pneumothorax , or edema . Streaky opacities in the left lower lung may reflect a small degree of atelectasis . Cardiomediastinal and hilar contours are unchanged . Heart is top - normal in size . Atherosclerotic calcifications in the aortic knob are unchanged . No acute osseous abnormality .
    OUTPUT:
    
Mild atelectasis in the left lower lung . No significant interval change .