Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient 's clinical condition required examination in sitting semi-upright position using AP frontal and left lateral view . Mild cardiac enlargement is probably present . No typical configurational abnormality is seen . The thoracic aorta is generally widened and elongated and demonstrates calcium deposits in the wall , mostly at the level of the arch . A permanent pacer appears in left anterior axillary position being connected to one intracavitary electrode seen to terminate in the apical portion of the right ventricle pointing anteriorly . A sizable hiatal hernia with typical air - fluid level is noted in retrocardiac position . There appear two linear densities on the right base likely representing peripheral plate atelectasis . The lateral and posterior pleural sinuses are free , and there is no pneumothorax on either side of the thorax in the apical area . Our records do not include a previous chest examination available for comparison .
    OUTPUT:
    
Unremarkable single electrode pacer , no evidence of pneumothorax , right - sided basal peripheral plate atelectasis but no acute infiltrates and no pleural effusion .