Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A Swan - Ganz catheter terminates in the right main pulmonary artery and could be pulled back 3 - 4 cm for positioning in the main pulmonary artery . A left - sided pacer / defibrillator is unchanged in position . The cardiomediastinal silhouette is within normal limits and stable . The lungs are clear . There is no evidence of pneumothorax . No pleural effusion seen .
    OUTPUT:
    
1 . Swan - Ganz catheter terminates in the right pulmonary artery and could be pulled back 3 - 4 cm for placement in the main pulmonary artery . No evidence of pneumothorax .