Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lower lung volumes seen on the current exam with secondary crowding of the bronchovascular markings . Focal left basilar opacity is noted . There is no pleural effusion . The cardiomediastinal silhouette is within normal limits for technique . No acute osseous abnormalities .
    OUTPUT:
    
Low lung volumes with focal left basilar opacity which could be secondary to atelectasis although infection is not entirely excluded .