Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Low lung volumes cause bronchovascular crowding . There is no convincing evidence for focal consolidation , pleural effusion , pneumothorax , or pulmonary edema . Atelectasis is noted in the left lung base The cardiomediastinal silhouette is within normal limits .
    OUTPUT:
    
Low lung volumes cause bronchovascular crowding and left basilar atelectasis . No definite focal consolidation .