Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . There is a 3 mm opacity overlying left anterior 8th rib . There is effusion or pneumothorax . The cardiomediastinal silhouette is normal . Imaged osseous structures are intact . No free air below the right hemidiaphragm is seen .
    OUTPUT:
    
1 . 3 mm opacity overlying the left anterior 8th rib could represent a pulmonary nodule versus end on vessel . Non-urgent Chest CT is recommended .