Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP upright chest radiograph is obtained . Lung volumes are low with bronchovascular crowding likely accounting for the opacities in the lower lungs . There is no definite sign of pneumonia , effusion , or pneumothorax . No overt CHF is seen . Cardiomediastinal silhouette is stable . Bony structures are intact .
    OUTPUT:
    
Limited , negative .