Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . In the interval since the prior study , there has been development of a rounded opacity involving the lateral right mid hemithorax with up to its margin , suggesting that it is pleural in origin and concerning for a mass . The lateral fourth right rib at this location is not fully visualized , which may be technical ; however , due to the above findings , chest CT is recommended for further evaluation . The left lung is clear . There is blunting of the posterior right costophrenic angle and a trace effusion can not be excluded . No evidence of pneumothorax is seen . Cardiac and mediastinal silhouettes are unremarkable . There are degenerative changes along the spine .
    OUTPUT:
    
Rounded opacity in the lateral right mid hemithorax likely pleural - based , developed since the prior study with the adjacent bone difficult to trace . Recommend chest CT for further evaluation .