Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable upright view of the chest . Lung volumes are low . Overlying EKG leads are present . Faint left basal atelectasis noted . No convincing signs of pneumonia or edema . No large effusion or pneumothorax . Heart size is difficult to assess given low lung volumes . Mediastinal contour is unchanged . Bony structures are intact . No free air below the right hemidiaphragm .
    OUTPUT:
    
Limited , negative .