Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest . Vague opacity projecting over the right lateral lung is compatible with bifid anterior right 4th rib . The lungs are otherwise clear . The cardiomediastinal silhouette is within normal limits . Descending thoracic aorta is tortuous . There is no acute osseous abnormality . No free air seen below the diaphragm .
    OUTPUT:
    
No acute cardiopulmonary process .