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 dated ___ . The heart size remains within normal limits and is unchanged in configuration . Thoracic aorta mildly widened and elongated , but no local contour abnormalities or wall calcifications 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 . There is no evidence of pneumothorax in the apical area on the frontal view . Skeletal structures of the thorax grossly unremarkable .
    OUTPUT:
    
Normal chest findings , stable appearance in comparison with previous study ___ years ago . Thus , no evidence of cardiac enlargement , pulmonary congestion or acute infiltrates .