Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Low lung volumes accentuate the pulmonary vascular markings . The lungs are clear without any focal opacities , pulmonary edema , pleural effusion or pneumothorax . The heart and mediastinal contours are normal . Median sternotomy wires are seen . There is no free air seen underneath the diaphragm .
    OUTPUT:
    
No acute cardiopulmonary process . No free air underneath the diaphragm .