Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: As compared to prior chest radiograph from ___ , there is no visualization of a pleural line in the region of the right apex . However , there is absence of lung structure in the two apical centimeters of the right hemithorax , suggesting that the size of preexisting pneumothorax is not substantially changed . There is no evidence of tension . The left lung is clear . Pneumomediastinum appears less severe on this examination . Air collection is again seen in the right cervical and lateral soft tissues .
    OUTPUT:
    
Non visualization of pleural line with absence of lung structures in the two apical centimeters of the right hemithorax suggesting that size of preexisting pneumothorax is not substantially changed . These findings were discussed with Dr . ___ by Dr . ___ via telephone on ___ at 12 :35 p .m . , at time of discovery .