Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest were provided . In this patient with known cancer , there is left perihilar opacity with retraction of the hilum , better characterized on the CT torso dated ___ . The overall appearance of the chest appears stable from prior exam . There is no evidence of pneumonia or CHF . No effusion or pneumothorax . The heart size is stable . Bony structures appear intact . An old right deformity is redemonstrated along the eighth right posterior rib .
    OUTPUT:
    
Left hilar opacity with upward retraction of the left hilar structures , stable from prior exam in this patient with known lung cancer . No signs of superimposed pneumonia .