Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs were obtained . The lung volumes are decreased since the most recent exam , which accentuates the pulmonary vascular markings . Otherwise , the lungs are clear . Heart and mediastinal contours are normal . The patient is status post coronary artery bypass . Midline sternotomy wires are intact . Minimal aortic arch calcifications are identified .
    OUTPUT:
    
No acute cardiopulmonary process .