Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A Swan - Ganz catheter tip is located in the main pulmonary artery , slightly pulled back from the prior study but in appropriate position . Pacemaker leads in the right atrium , right ventricle and coronary sinus are unchanged . The lungs are clear without focal consolidation , pleural effusion or pneumothorax . The cardiac silhouette remains enlarged . The imaged upper abdomen is unremarkable . The bones are intact .
    OUTPUT:
    
Swan - Ganz catheter tip in the main pulmonary artery , in appropriate position . Otherwise , no significant change .