Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are lower when compared to the prior study . Moderate cardiomegaly is again demonstrated , with the heart size accentuated by the low inspiratory lung volumes . Left - sided pacemaker device is re - demonstrated with leads terminating in the right atrium and right ventricle . Mediastinal and hilar contours are normal , and the pulmonary vascularity is not engorged . The lungs are clear . No pleural effusion or pneumothorax is detected . There are no acute osseous abnormalities .
    OUTPUT:
    
Low lung volumes . No acute cardiopulmonary abnormality .