Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: In comparison with chest radiograph from ___ , slightly increased left retrocardiac opacity suggests atelectasis or infection . Right lower lobe atelectasis has increased . There is no pleural effusion or pneumothorax . There is no vascular congestion or interstitial pulmonary edema . Mediastinal contours are stable . Mild cardiomegaly and mild tortuosity thoracic aorta are unchanged .
    OUTPUT:
    
1 . Slightly increased left retrocardiac opacity suggests atelectasis or infection . 2 . Increased right lower lobe atelectasis .