Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A pacemaker is present , with leads overlying the right atrium and right ventricle . There is cardiomegaly . There is a small - to - moderate left effusion with underlying collapse and / or consolidation . There is a small right effusion , likely with atelectasis and / or consolidation at the right base . There is upper zone redistribution . There are diffusely increased interstitial markings , more than on ___ . The left effusion and left base opacities are increased . The right base opacities are not clearly changed . Heart size is similar .
    OUTPUT:
    
1 . Increased interstitial markings could reflect an element of CHF . Other interstitial processes can not be entirely excluded . 2 . Interval increase in left pleural effusion with underlying collapse and / or consolidation . The differential diagnosis includes a pneumonic infiltrate . 3 . Stable small right effusion with right basilar opacities .