Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low with secondary bronchovascular crowding . No confluent consolidation is identified . There is mild central pulmonary vascular congestion , though no overt interstitial edema . No pneumothorax is evident . Cardiomediastinal and hilar contours are within normal limits . There is no subdiaphragmatic free air .
    OUTPUT:
    
Low lung volumes with possible central pulmonary vascular congestion . No free air .