Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post median sternotomy . The heart size is normal . No pleural effusion ( although the right costophrenic angle is excluded ) or pneumothorax identified . No suspicious opacities for infectious process . No pulmonary edema . Streaky left lower lobe atelectasis is stable and likely represents scarring .
    OUTPUT:
    
No acute cardiopulmonary process .