Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: As compared to prior , opacity at the left lung apex and left perihilar region , similar in appearance . Lung volumes are slightly lower . The right lung is grossly clear . There is mild elevation of the left hemidiaphragm . A Port - A - Cath with coiling of the proximal portion of the device ends in the mid SVC , unchanged in appearance .
    OUTPUT:
    
Similar appearance of left apical and perihilar opacity corresponding to known lung cancer .