Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A single - lead pacemaker device terminates in the right ventricle . There is a fiducial marker projecting over an area of opacification in the left lower lobe that includes an irregular mass - like component as well as substantial underlying pleural thickening along the left lower lateral chest . The most recent comparison is the frontal scout view from the CT of ___ ; there is now greater opacification in the vicinity of the fiducial marker than seen earlier . The lateral view also suggests peripheral consolidation in the same area of the left lower lobe . Calcified pleural plaques are present . The lungs are hyperinflated . Mild - to - moderate compression deformities of the mid - to - lower thoracic spine appear similar . The bones are demineralized . A chronic - appearing right posterolateral fifth rib fracture appears unchanged .
    OUTPUT:
    
Increasing opacification near a fiducial marker in the left lower lobe ; differential considerations include radiation pneumonitis or post-obstructive infection in the appropriate clinical setting , superimposed on known malignancy .