Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: As before , the patient is status post midline sternotomy , with intact wires . The lungs are clear , but overinflated . Previously seen small bilateral pleural effusions have resolved . Moderate cardiomegaly , including evidence of left atrial enlargement , is not significantly changed . The descending thoracic aorta is slightly tortuous , as before . There is no pneumothorax .
    OUTPUT:
    
1 . No acute cardiac or pulmonary findings . 2 . Unchanged moderate cardiomegaly .