Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Low lung volumes limits evaluation . Bronchovascular crowding noted at the lung bases which slightly less since with an improved inspiration . Allowing for study limitations , there is no convincing evidence for pneumonia , edema , effusion or pneumothorax . Cardiomediastinal silhouette is unremarkable . Bony structures appear intact .
    OUTPUT:
    
Limited , negative .