Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lungs are fully expanded . There is a well - defined 6 mm rounded opacity projecting over the anterior right sixth rib . No pleural abnormalities . Heart size is normal . Cardiomediastinal and hilar silhouettes are normal .
    OUTPUT:
    
No evidence of a significant cardiopulmonary abnormality . A small rounded opacity projecting over the anterior right sixth rib is likely calcification of costochondral cartilage , however recommend anterior shallow oblique radiographs for confirmation .