Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A single lead pacemaker device terminates in the right ventricle . The patient is status post coronary artery bypass graft surgery . The heart is mildly enlarged . The cardiac , mediastinal and hilar contours appear stable . Streaky opacities indicate chronic scarring at the left lung base with a small , probably chronic pleural effusion including loculation . The chest is hyperinflated . Very mild vascular congestion is suspected . The bones appear demineralized .
    OUTPUT:
    
Findings suggest very mild vascular congestion . Stable atelectatic changes at the left lung base and chronic small left - sided pleural effusion . Stable cardiomegaly .