Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Bronchial valve is in place . No pneumothorax . Left basilar scarring or atelectasis , stable . Right lung clear . No pleural effusion .
    OUTPUT:
    
Left lower lobe subsegmental atelectasis . No significant pulmonary edema . No pneumothorax . Overall stable exam compared to ___ at 08 :43 .