Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild cardiomegaly is stable . . The lungs are grossly clear . There are minimal bibasilar atelectasis left greater than right . There is no pulmonary edema . There is no pneumothorax or pleural effusion . There are moderate degenerative changes in the thoracic spine . Sternal wires are aligned . Patient is status post CABG . Stent projects in the left subclavian region
    OUTPUT:
    
No acute cardiopulmonary abnormalities . If clinically persistent concern of rib fractures , dedicated rib series can be performed