Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Upright supine portable AP chest radiograph was provided . Left CP angle is excluded on both views provided . The lungs appear clear bilaterally without definite signs of pneumonia or CHF . Cardiomediastinal silhouette appears stable . Bony structures appear intact . Right AC joint arthropathy noted .
    OUTPUT:
    
Limited , negative .