Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral radiographs of the chest demonstrate large right - sided pleural effusion occupying greater than two - thirds of the right hemithorax with persistent moderate - sized right apical pneumothorax . The left lung is clear . The cardiomediastinal and hilar contours are unchanged .
    OUTPUT:
    
Large right - sided hydropneumothorax , increased in size from the prior study .