Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: An esophageal stent is in unchanged position . A left Port - A - Cath terminates in the right atrium , unchanged from prior . A left PleurX drain terminates in the medial left lung base . There is a persistent left apical pneumothorax , though it has decreased in size since the most recent prior examination . A small right pleural effusion and right basilar atelectasis appear unchanged from prior . There is overall improved aeration of the left lung base which may be secondary to reduction in the left pleural effusion or possibly decreased atelectasis . The cardiomediastinal and hilar contours are within normal limits and unchanged .
    OUTPUT:
    
1 . Interval decrease in size of left apical pneumothorax , now small . 2 . Improved aeration of the left lung base either due to decrease in left pleural effusion or decreased atelectasis .