Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared with earlier the same day at 08 : 55 , the right pigtail catheter is similar in configuration . Again seen is a small right apical pneumothorax smaller than on ___ at 08 :38 , though more apparent than on the film obtained earlier the same day . The patchy opacity in the right mid / lower zone is grossly unchanged and may lie within the right middle lobe . While this probably represents right middle lobe atelectasis , an area of aspiration pneumonitis or early infectious infiltrate could have a similar appearance . Minimal subsegmental atelectasis left base is similar to prior . Known metastatic pulmonary nodules again noted . No CHF .
    OUTPUT:
    
Pigtail catheter unchanged in position . A small right apical pneumothorax remains present . Patchy opacity in right mid / lower zone , similar to earlier the same day , allowing for technical differences --___ atelectasis versus early pneumonia or aspiration pneumonitis .