Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest were provided . Midline sternotomy wires and mediastinal clips are again noted . There is known mass at the right lung base which is similar in appearance to prior CT . There is no clear sign of superimposed pneumonia . The heart appears mildly enlarged . The mediastinal contour appears stable from the prior chest radiograph . Bony structures are unchanged .
    OUTPUT:
    
Mass - like opacity at the right lung base is similar to findings on CT abdomen and pelvis from ___ . No clear signs of superimposed pneumonia .