Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiomediastinal silhouette and hila are normal . There is a right infrahilar opacity . Faint left atelectatic change . There is mild vascular congestion .
    OUTPUT:
    
Left basilar atelectasis . Right basilar patchy opacity may also reprsent atelectasis but can not exclude right base pneumonia .