Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is mildly enlarged . The main pulmonary artery contour is again mildly prominent . The mediastinal and hilar contours appear unchanged . Streaky right infrahilar opacity is similar and appears most suggestive of atelectasis associated with large epicardial fat pad , seen on the prior CT . Smooth opacity also appears similar in the left costophrenic sulcus . There is no pneumothorax . An old right posterolateral sixth rib fracture appears unchanged .
    OUTPUT:
    
Findings most suggestive of persistent scarring or atelectasis at the lung bases , with a possible small left - sided pleural effusion .