Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: As compared to yesterday , moderate right pleural effusion is stable , and there are no signs of pneumothorax . The position of the right pigtail pleural drain is unchanged , and could be fissural so it might not continue to drain effectively . The lung volume asymmetry persists , with right lung smaller than the left lung due right base atelectasis . The amount of pleural effusion is stable , mainly in the right lung base and with minimal intrafissural component . Stable left mid-lung opacity , already described in recent CT , without pleural effusion . The cardiomediastinal silhouette is normal .
    OUTPUT:
    
No pneumothorax . The pig - tail pleural drainage ___ might be in the major fissure and it might not continue to work properly . Persistent reduced right lung volume due to right basal atelectasis and moderate pleural effusion .