Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Multiple calcified mediastinal and perihilar lymph nodes are seen . No pleural effusion or pneumothorax is seen . The cardiac and mediastinal silhouettes are unremarkable . There may be subtle reticular nodular opacities at the right upper lung and to a lesser extent in the left upper lung , which is nonspecific , but could be due to small airways infection or inflammation .
    OUTPUT:
    
Possible subtle reticular nodular opacity at the right upper lung , nonspecific but could be due to small airways infection or inflammation . There may also be subtle involvement of the left upper lung . Calcified hilar and mediastinal lymph nodes may be from prior granulomatous disease .