Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright and lateral views of the chest provided . A subtle opacity projecting over the right upper lung appears increased in overall conspicuity compared with the prior exam . This finding could represent prominent costochondral calcification , however a true pulmonary nodules impossible to exclude . A nonemergent CT chest may be performed to further assess . Otherwise , there is no focal consolidation , effusion , or pneumothorax . The cardiomediastinal silhouette is normal . Imaged osseous structures are intact . No free air below the right hemidiaphragm is seen .
    OUTPUT:
    
Subtle opacity projecting over the right upper lung which may represent prominent costochondral calcification though nodule difficult to exclude . Nonemergent CT chest may be obtained to further assess .