Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest were provided . The lung volumes are low with bronchovascular crowding likely accounting for subtle opacities in the medial lung bases . No convincing signs of pneumonia , CHF , effusion or pneumothorax . The heart size is stable . Mediastinal contour is unremarkable and unchanged . The bony structures are intact .
    OUTPUT:
    
Limited , negative .