Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post median sternotomy and CABG . The cardiac silhouette size is top normal . Mediastinal and hilar contours are within normal limits . There is calcification of the aortic knob . The pulmonary vasculature is normal . Linear opacities in the left lung base likely reflect subsegmental atelectasis . No pleural effusion , focal consolidation or pneumothorax is identified . There are no acute osseous abnormalities .
    OUTPUT:
    
No acute cardiopulmonary abnormality .