Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Multiple monitoring devices overlie the right hemi thorax limiting assessment . A dual lead pacemaker is unchanged in position compared to the prior study . Previous median sternotomy and coronary artery bypass graft clips noted . There is new left lower lobe atelectasis , moderate - sized hiatus hernia . The right perihilar opacity is essentially unchanged compared to the prior study . Probable small left pleural effusion .
    OUTPUT:
    
Left lower lobe atelectasis , small left pleural effusion .