Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest were reviewed . Compared to the most recent prior study , lung volumes have improved and only mild subsegmental left lower lobe atelectasis remains . Otherwise , the lungs are clear . There is no pleural effusion or pneumothorax . Postoperative mediastinal enlargement continues to decrease , however , the mediastinum remains mildy enlarged . Moderate cardiomegaly is unchanged . A right internal jugular line ends in the upper superior vena cava .
    OUTPUT:
    
1 . Lung volumes have increased and mild left lower lung atelectasis has improved since ___ . 2 . Postoperative mediastinal enlargement has improved since ___ . 3 . Moderate cardiomegaly is unchanged .