Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: In comparison with the study of ___ , there has been a substantial increase in pleural effusion on the right , filling about half of the hemithorax . The left lung shows only mild atelectatic changes with blunting of the costophrenic angle . No evidence of pulmonary vascular congestion . Little change in the appearance of the thoracic fusion device .
    OUTPUT:
    
Worsening right pleural effusion .