Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Since the radiograph obtained 1 day prior , there has been a small amount of improvement in aeration of the mid left lung and at the large , mid left lung opacity corresponding to the patient 's known mass is better appreciated . The small , loculated , left pleural effusion appears grossly unchanged . Bilateral interstitial edema has decreased . There is no pneumothorax . Subcutaneous emphysema of the left chest wall and left neck has decreased . The left - sided pigtail catheter and left lower lung pleural drainage catheter are unchanged in position .
    OUTPUT:
    
Improved aeration of the mid left lung and improvement of interstitial edema . Large left juxta hilar mass and moderate left pleural effusion persist .