Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: 3 lead left pacemaker is intact with leads in the appropriate positions located in the right atrium , right ventricle , and coronary sinus . The lung volumes are stable . There is a chronic right middle lobe opacity which slightly obscures the medial right hemidiaphragm but is unchanged since ___ . Bilateral pulmonary infiltrates are unchanged . The cardiomediastinal hilar contours are unchanged . The pleural surfaces are unchanged .
    OUTPUT:
    
Left pacemaker intact with leads in the appropriate positions . No pneumothorax . Unchanged bilateral pulmonary infiltrates .