Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post previous median sternotomy and coronary bypass surgery . Heart is upper limits of normal in size with left ventricular configuration and is slightly increased since the prior study . Tortuosity of the thoracic aorta is unchanged . Pulmonary vascularity is normal . Lungs are clear except for minimal linear bibasilar atelectasis or scarring .
    OUTPUT:
    
No acute cardiopulmonary abnormality .