Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post coronary artery bypass graft surgery . The heart is mildly enlarged . The lung volumes are low . The mediastinal and hilar contours are stable . A mild interstitial abnormality is similar to the earlier radiographs but more prominent than earlier on the same day , although apparent change may be due to differences in technique . There is minimal loss in several mid thoracic vertebral body heights , not significantly changed , with slightly exaggerated kyphotic curvature .
    OUTPUT:
    
Similar mild interstitial abnormality , probably due to vascular congestion , although not necessarily an acute finding .