Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Insertion of right - sided PleurX catheter with mild decrease in right - sided effusion which is now moderate to large . Slight improvement of aeration of the right midlung zone . No apical pneumothorax . The left lung is clear .
    OUTPUT:
    
Insertion of right - sided PleurX catheter right - sided effusion which is now moderate to large . No apical pneumothorax .