Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . The patient is status post median sternotomy and CABG . Heart size is mildly enlarged but unchanged . Mediastinal and hilar contours are stable . Pulmonary vasculature is normal . Apart from minimal atelectasis in the left lung base , the lungs are clear without focal consolidation . No pleural effusion or pneumothorax is identified . There are no acute osseous abnormalities .
    OUTPUT:
    
No acute cardiopulmonary abnormality .