Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A left - sided pacemaker generator is in unchanged position . Leads are intact and terminate in the expected location of the right atrium and right ventricle , unchanged from prior . There are diffuse increased interstitial opacities , which may be secondary to atypical infection or mild pulmonary edema . There are possible small bilateral pleural effusions . There is no pneumothorax . Mediastinal and hilar contours appear within normal limits .
    OUTPUT:
    
Increasing reticular opacities concerning for either mild edema or atypical infection