Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . The patient is status post median sternotomy and cardiac valve replacement . The cardiac silhouette is mildly enlarged . There are relatively low lung volumes . Mediastinal contours are stable . There is no overt pulmonary edema . No focal consolidation or large pleural effusion is seen . There is no evidence of pneumothorax . No displaced fracture is seen .
    OUTPUT:
    
No acute cardiopulmonary process . No displaced rib fracture is seen , however , if clinical concern is high , dedicated rib series or CT is more sensitive .