Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright view of the chest provided . There is no focal consolidation , effusion , or pneumothorax . Linear opacities at the left base likely represent scarring or subsegmental atelectasis . The cardiomediastinal silhouette is normal . No free air below the right hemidiaphragm is seen . Lungs are hyperinflated suggesting underlying emphysema .
    OUTPUT:
    
Left basilar linear opacity likely reflecting scarring or subsegmental atelectasis . Hyperinflation suggesting underlying emphysema . No evidence of focal pneumonia or pleural effusion .