Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Sternotomy wires and CABG materials are unchanged . A left pacer / defibrillator unit is seen with two leads in the left ventricle , one of which is likely abandoned . The heart size is large , but stable . The mediastinal and hilar contours are within normal limits . The lungs are clear with no new opacities . There is no evidence for pulmonary edema . There is no pleural effusion or pneumothorax . Minimal degenerative changes are seen in the thoracic spine .
    OUTPUT:
    
No evidence of pneumonia .