Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A left - sided dual - lead pacemaker device is noted with leads in the right atrium and right ventricle in appropriate position . Bilateral low lung volumes are noted with crowding of bronchovascular markings . Cardiac silhouette appears mildly accentuated by lower lung volumes . Opacification at the right lung base may represent atelectasis ; however , infectious process such as pneumonia can not be completely excluded in the correct clinical setting .
    OUTPUT:
    
1 . Bilateral low lung volumes with crowding of bronchovascular markings . 2 . Opacification of the right lung base may represent atelectasis ; however , infectious process such as pneumonia should be considered in the correct clinical setting .