Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a left - sided pacemaker with leads unchanged in position . The heart is mildly enlarged . Lungs are hyperinflated . Faint opacity at the left lung base may reflect a combination of atelectasis and effusion although an early consolidation is not excluded .
    OUTPUT:
    
Faint opacity at the left lung base likely reflecting atelectasis and effusion although an early consolidation is not excluded .