Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Again seen is cardiomegaly and left - sided biventricular pacing device , with similar lead placement . Also again seen is a right IJ Swan - Ganz catheter , with tip near the origin of the right pulmonary artery . Cardiomegaly is similar prior . There is upper zone redistribution , without other evidence of CHF . There has been clearing of previously seen retrocardiac opacity . No new infiltrate is identified . No gross effusion . No pneumothorax detected .
    OUTPUT:
    
No focal pneumonic infiltrate detected . Swan - Ganz catheter tip lies in the region of the origin of the right pulmonary artery .