Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest were provided . There is a Port - A - Cath residing over the left chest wall with catheter tip in the region of the lower SVC . There is near - complete opacification of the left hemithorax which is unchanged from prior exam . The right lung remains clear without definite signs of pneumonia . The heart and mediastinal contour difficult to assess . The bony structures appear intact .
    OUTPUT:
    
Near - complete opacification of the left hemithorax similar to prior exam in this patient with known extensive lung cancer . No definite signs of superimposed pneumonia in the right lung .