Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Triangular - shaped opacity in the right upper lobe is suspicious for pneumonia . Minimal interval improvement of vascular congestion . Patchy opacities at lung bases are likely due to atelectasis . Heart size is still enlarged . No pneumothorax or pleural effusion . Unchanged left axillary pacemaker with two leads following the expected course , ending in right atrium , right ventricle .
    OUTPUT:
    
Right upper lobe opacity suspicious for pneumonia .