Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Prior median sternotomy changes are evident . Sternal sutures are intact . Right lower lung opacity from loculated pleural effusion has significantly improved following placement of pleural pigtail catheter positioned at the right lung base . Small right pleural effusion persists . Left lung is clear . Cardiomediastinal silhouette is within normal limits .
    OUTPUT:
    
Pleural pigtail catheter placement in the right lower chest . The right lower lung opacity from loculated pleural effusion has significantly resolved . Some small right pleural effusion persists and there is no pneumothorax .