Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: As before , the patient is status post midline sternotomy . Fractures through the two superior - most sternotomy wires are not significantly changed . There is minimal left lower lung scarring / atelectasis , as before . There is minimal right mid lung scarring . There are no definite pleural effusions . No pneumothorax is seen . The heart size is top normal , slightly increased compared to the prior study from ___ . The mediastinal contours are normal .
    OUTPUT:
    
No acute cardiac or pulmonary findings .