Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is linear scarring at the left lung base and at the lung apices . On the lateral view there is focal opacity projecting over the region of the undersurface of the aortic arch not clearly present on prior . The lungs are otherwise clear without focal consolidation , effusion , or pneumothorax . The cardiomediastinal silhouette is within normal limits . Hypertrophic changes are noted in the spine . There is no visualized displaced fracture .
    OUTPUT:
    
No acute cardiopulmonary process . Focal opacity on the lateral view projecting at the level of the undersurface of the aortic arch . While this could be due to overlapping shadows , repeat exam with lateral suggested and if it persists , CT may be necessary . ___ , MD