Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A chest tube terminates near the left apex . A linear interface in the medial left lower lung with adjacent lung opacification is new since ___ ___ . The right lung is well expanded and clear . Prominent mediastinal contour is due to fat , unchanged from CT on ___ . Cardiac silhouette is normal . Small if any right pleural effusion .
    OUTPUT:
    
1 . Linear interface in the left lower lung may represent a small to moderate medial pneumothorax or overlying object external to the patient . 2 . Opacity in the left lung base is likely due to atelectasis or postoperative changes .