Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared with the most recent prior study , the previously seen right upper zone pneumothorax has decreased considerably . Doubt but can not entirely exclude a tiny residual apical pneumothorax . Again seen is the right - sided pigtail catheter -- on the current exam , it liesslightly higher and against the inner surface of the mid / lower right chest wall . Previously seen atelectasis at the right lung base has improved , though there is new irregular opacity in the right mid zone . Left line remains grossly clear except for known pulmonary nodules . No pleural effusion detected .
    OUTPUT:
    
Near complete versus complete resolution of the right apical pneumothorax . Resolution of previously seen right base atelectasis . New faint patchy opacity in the right mid / lower zone including area of chain sutures and pigtail catheter . Suspect represent an area of early atelectasis , though an early infectious infiltrate or area of aspiration pneumonitis could have a similar appearance .