Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: New right - sided pleural drainage with interval decrease in right - sided pleural effusion which is now moderate . Small new apical pneumothorax . The left lung is unchanged . Right - sided Port - A - Cath with the tip in the right atrium .
    OUTPUT:
    
Small right apical pneumothorax post thoracentesis .