Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP single view of the chest was obtained with patient in sitting semi-upright position . Comparison is made with the next preceding similar study of ___ obtained at 15 :35 p .m . Findings on a new portable chest examination are practically identical with those of the previous study . Position of pigtail end catheter in the right lower hemithorax unaltered . The same holds for the right - sided pleural effusion and the hydropneumothorax with rather high degree of right lung collapse . No new abnormalities identified . No significant mediastinal shift is observed .
    OUTPUT:
    
Unchanged size and position of right - sided hydropneumothorax over the last ___-hour examination interval .