Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared with the previous exam there has been interval placement of a pigtail catheter which ends in a paramediastinal location in the left mid lung region . There has been interval resolution of the previously seen pneumothorax . Severe left lower lobe atelectasis persists . The right lung is hypoinflated , resulting in bronchovascular crowding but without focal opacities .
    OUTPUT:
    
1 . Interval resolution of left - sided pneumothorax after placement of a pigtail catheter . 2 . Persistent severe left lower lobe atelectasis .