Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP and lateral views of the chest . No prior . There is a focal peripheral opacity in the left mid lung laterally with configuration suggesting that it is pleural - based . The lungs are otherwise clear . The cardiomediastinal silhouette is within normal limits . No acute osseous abnormality is identified .
    OUTPUT:
    
Approximately 5 cm likely pleural - based mass on the left . Dedicated chest CT can be performed to further characterize .