Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post coronary artery bypass graft surgery . There is a dual - lead pacemaker with leads again terminating in the right atrium and ventricle , respectively . The heart is mildly enlarged . The aortic arch is calcified . The cardiac , mediastinal and hilar contours appear unchanged . There is a widespread mild interstitial abnormality which is of uncertain chronicity . This is most confluent in the lower lungs and in subpleural regions . Although a component of this may be due to pulmonary vascular congestion , intrinsic interstitial lung disease is an additional consideration to consider . Streaky left basilar opacities suggest atelectasis , not significantly changed . The bones are probably demineralized . Mild degenerative changes are noted along the thoracic spine .
    OUTPUT:
    
1 . Mild interstitial abnormality , most prominent along costophrenic angles , which could be seen with a component of mild vascular congestion , but the possibility of a more chronic abnormality such as intrinsic lung disease should also be considered . 2 . Patchy left basilar atelectasis , not significantly changed and accordingly suggestive of chronic scarring .