Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There has been slight interval increase in the right basal pneumothorax as compared to the earlier exam . Aeration at the left base has improved , and there is decreased left basilar subsegmental atelectasis . The left lung remains clear . Sternotomy wires are intact and aligned . The patient has had prior valve replacement and right shoulder repair . Multiple acute right - sided rib fractures are unchanged .
    OUTPUT:
    
Slight interval increase in known right basilar hydropneumothorax following chest tube clamping . Unchanged acute right rib fractures .