Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . Minimal focus of opacity projecting over the right lung base may represent calcified costal cartilage versus true pulmonary nodule . This was not seen on prior exam . Other than this , lungs are clear . No effusion or pneumothorax . Cardiomediastinal silhouette is normal . Imaged osseous structures are intact . No free air below the right hemidiaphragm is seen .
    OUTPUT:
    
Subtle nodular opacity projecting over the right lung base may represent calcified costal cartilage versus true nodule . Consider obliques views to better assess .