Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is normal in size . The cardiomediastinal contour is within normal limits . Lung volumes are low , causing some bronchovascular crowding . There is no focal consolidation identified . Opacity at the right hilum is similar appearing to the prior examination , given differences in inspiration . Mild diffuse interstitial changes are present . There is no evidence of pleural effusion or pneumothorax .
    OUTPUT:
    
Low lung volumes . No acute cardiopulmonary abnormality .