Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A rounded opacity in the right upper lung continues to decrease in conspicuity , likely post-operative hematoma / atelectasis . Mild - to - moderate left retrocardiac atelectasis is not significantly changed . There is mild pulmonary vascular congestion . There is no definite pneumothorax . Small bilateral pleural effusions are not significantly changed . The heart size is normal . The mediastinal contours are normal .
    OUTPUT:
    
1 . Resolving right upper lung post-operative hematoma / atelectasis . 2 . No definite pneumothorax . 3 . Small bilateral pleural effusions , not significantly changed . 4 . Unchanged mild - to - moderate left retrocardiac atelectasis .