Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is improved aeration at the left lung base from the most recent prior study . Small bilateral pleural effusions are slightly decreased and pulmonary vascular congestion is improved . There is no definitive evidence of pneumothorax . Retrocardiac opacification is unchanged dating back to ___ , but increased from ___ . Persistent right lower lobe opacification may represent atelectasis or pneumonia . Enlargement of the cardiac silhouette and prominence of the mediastinum relating to an unfolded thoracic aorta are stable . The patient has been extubated from the most recent prior study . A humeral fixation plate with multiple screws in the right humeral head is partially imaged . Right rib fractures are less well seen on today 's study .
    OUTPUT:
    
1 . Persistent right lower lobe opacification may represent atelectasis or pneumonia . 2 . Decreased small bilateral pleural effusions and pulmonary vascular congestion .