Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low resulting in bronchovascular crowding . Minimal opacities within the lung bases are improved from prior and likely reflect atelectasis . No large confluent consolidation is identified . There is no pulmonary edema or large pleural effusion . Cardiomediastinal and hilar contours are within normal limits . Dense calcifications of the aortic knob are unchanged . There is no pneumothorax .
    OUTPUT:
    
Low lung volumes though no acute cardiopulmonary process .