Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest views were obtained with patient in upright position . Analysis is performed in direct comparison with the next preceding similar study of ___ . The heart size is unchanged and remains within normal limits . Unremarkable size of thoracic aorta as before with a few calcium deposits in the wall at the level of the arch . No local contour abnormalities are identified . The pulmonary vasculature is not congested . No signs of acute or chronic parenchymal infiltrates are present and the lateral and posterior pleural sinuses are free . No pneumothorax in the apical area on frontal view . Skeletal structures of the thorax grossly unremarkable .
    OUTPUT:
    
Unchanged normal chest findings in comparison with same examination two days earlier . Our records do not include any other previous chest examinations available for comparison .