Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright portable chest radiograph was provided . The lung volumes are low . Bronchovascular crowding and atelectasis probably is likely present in the lower lungs . No convincing signs of pneumonia or overt CHF . No large effusion or pneumothorax is seen . The heart and mediastinal contours appear within normal limits . Bony structures are intact .
    OUTPUT:
    
Limited , negative .