Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP upright chest radiograph obtained . There are calcified breast implants noted bilaterally , partially obscuring the lung bases . There is no clear sign of pneumonia or CHF . No pneumothorax is seen . The heart is top normal in size . Mediastinal contour is normal . Bony structures are intact .
    OUTPUT:
    
Calcified breast implants slightly obscure the lung bases . No pneumothorax .