Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are slightly low , resulting in bronchovascular crowding . Overall no significant change from ___ . Streaky linear opacities in the retrocardiac region may reflect atelectasis . No overt edema . No pleural effusion and no pneumothorax . The cardiomediastinal silhouette is unchanged . The patient is status post median sternotomy .
    OUTPUT:
    
No acute cardiopulmonary process .