Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest . The lungs are hyperinflated . There are regions of consolidation at the left lung base confirmed on the lateral , localizing to the lingula . More peripheral opacities are likley in part due to callous formation from healing left posterior seventh and eighth rib fractures . Elsewhere , the lungs are clear . The cardiomediastinal silhouette is within normal limits . No acute osseous abnormality is identified . Healing left are identified .
    OUTPUT:
    
Left base opacity , persistent since early ___ , compatible with infection in the proper clinical setting vs atelectasis . Please repeat after treatment to document resolution , CT may be necessary if it does not clear by radiographs .