Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP single view of the chest has been obtained with patient in semi-supine position . Analysis is performed in direct comparison with the next preceding portable chest examination of ___ . Cardiac enlargement , widening of thoracic aorta , and significant right - sided convex scoliosis of the thoracic spine are as before . On the present examination , a permanent pacer capsule is identified in left anterior axillary position seen to be connected to a single intracavitary electrode with termination point compatible with right ventricular apical position . The pulmonary vasculature has not undergone any change , and there is no evidence of pneumothorax on either right or left side . No new infiltrates are seen .
    OUTPUT:
    
Single electrode permanent pacer placed , no pneumothorax .