Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A dual - lead pacemaker / ICD device appears unchanged . The cardiac , mediastinal and hilar contours appear stable . There is new retrocardiac opacification and possibly a very small right - sided pleural effusion . A small subpulmonic effusion on the left is also possible . A cavitary lesion persists in the left upper lobe although not optimally assessed . Ground glass opacities noted recently in the right upper lobe are not likely to be well appreciated on portable radiography .
    OUTPUT:
    
Persistent but poorly visualized cavity lesion in the left upper lobe . New left basilar opacity , typical for atelectasis , although developing pneumonia is possible . Probably small effusions .