Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared to the most recent study from ___ , a small to moderate right apical pneumothorax has not significantly changed in size . The right - sided chest presumed pericardial catheter is unchanged in position . Right - sided perihilar opacification is unchanged . There is minimal left lower lung atelectasis . There are no definite pleural effusions . No left - sided pneumothorax .
    OUTPUT:
    
1 . No significant change in size of small to moderate right apical pneumothorax . The catheter projecting over the right hemithorax is presumably a pericardial drain and not a pleural catheter . 2 . Unchanged right perihilar opacity .