Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Two portable upright views of the chest . No prior . Increased density projecting over the right lower lung likely due to anterior right sixth rib fracture . The lungs are otherwise clear . There is no pleural effusion or pneumothorax . Cardiomediastinal silhouette is within normal limits . No free air identified below the diaphragm .
    OUTPUT:
    
Essentially unremarkable portable chest x-ray . No free air is seen below the diaphragm .