Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Right - sided pacemaker device is noted with leads terminating in the right atrium and right ventricle . Heart size remains at least moderately enlarged , although the inferior aspect of the heart is not completely imaged on the frontal view . The aortic knob remains calcified . Mediastinal and hilar contours are relatively unchanged with calcified lymph nodes again likely reflective of prior granulomatous disease . Lung volumes are low . There is crowding of the bronchovascular structures , with probable mild pulmonary vascular congestion . Trace bilateral pleural effusions are noted . Linear opacities within both lung bases likely reflect atelectasis . No pneumothorax is identified . No acute osseous abnormalities are detected .
    OUTPUT:
    
Low lung volumes . Mild pulmonary vascular congestion . Small bilateral pleural effusions . Bibasilar linear opacities likely reflect atelectasis .