Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: New bilateral lower lobe opacities suggest atelectasis vs . pneumonia in the appropriate clinical setting . Otherwise , no significant interval change . Stable top - normal heart size . Stable mediastinal and hila appearance . Unchanged position of the dual lead pacemaker device . No pneumothorax , pleural effusion , or pulmonary edema .
    OUTPUT:
    
Bilateral lower lobe opacity concerning for atelectasis vs . pneumonia .