Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size , mediastinal , and hilar contours are normal . Lung volumes are low with unchanged left hemidiaphragm elevation . Intact median sternotomy wires and mediastinal clips are unchanged . The ascending aorta is tortuous . Clear lungs without pleural effusion or pneumothorax . A USB flash drive projects over the left chest .
    OUTPUT:
    
No acute cardiopulmonary process .