Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left - sided dual - chamber pacemaker device is again noted with leads terminating in the regions of the right atrium and right ventricle . Moderate cardiomegaly persists and mediastinal contour is unchanged . There is crowding of the bronchovascular structures due to low lung volumes without overt pulmonary edema . Haziness within the right lung base likely reflects a layering small right pleural effusion . Streaky bibasilar opacities likely reflect areas of atelectasis . No pneumothorax is identified .
    OUTPUT:
    
Small layering right pleural effusion with bibasilar atelectasis .