Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Unchanged opacification of the left lung base likely due in part to pericardial fat pad and scarring or atelectasis . No new consolidation is identified . There is no overt pulmonary edema . Mediastinal and hilar contours are within normal limits and unchanged . The heart size remains moderately enlarged .
    OUTPUT:
    
Unchanged left basilar opacity , likely in part due to scaring / atelectasis and fat pad and possible effusion . No acute cardiopulmonary process .