Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: An external monitor traverses the mediastinum and partially obscures the left apex . Lung volumes are low , but the visualized lungs are grossly clear . The right hilus appears prominent which may be due to prominent vascularity or lymphadenopathy . There is no pneumothorax . The heart and mediastinum are magnified by the projection . Incidental note is made of aortic arch calcifications .
    OUTPUT:
    
Grossly clear lungs . Mild prominence of the right hilus may be due to prominent vascularity or lymphadenopathy . PA and lateral radiographs may be obtained for further evaluation .