Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Right - sided dual - chamber pacemaker device is new in the interval with leads terminating in the right atrium and right ventricle . Moderate cardiomegaly is accentuated by a suboptimal inspiratory effort . Aorta is mildly unfolded . There is crowding of bronchovascular structures with mild pulmonary vascular congestion , but no overt pulmonary edema . Patchy opacities in the lung bases likely reflect areas of atelectasis . No pleural effusion or pneumothorax is identified . There are no acute osseous abnormalities .
    OUTPUT:
    
Low lung volumes with probable bibasilar atelectasis and mild pulmonary vascular congestion .