Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a left sided pacemaker , with lead tips over right atrium and right ventricle . The cardiomediastinal silhouette is enlarged , but unchanged . There is probable background COPD . There is a small to moderate right effusion with underlying collapse and / or consolidation and minimal atelectasis at the left base . The hila are both prominent , which may reflect pulmonary hypertension , but probably unchanged . There is probable mild vascular plethora , though the appearance is likely accentuated by underpenetration . .
    OUTPUT:
    
1 . Stable cardiomegaly . Pacemaker noted . 2 . Small right effusion with underlying collapse and / or consolidation . , improved compared with ___ . 3 . Minimal atelectasis left base , considerably improved compared with ___ 4 . Possible mild CHF . 5 . Bilateral hilar enlargement which may relate to pulmonary hypertension . 6 . No displaced rib fracture detected on these lung technique films .