Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest views were obtained with patient in upright position . Comparison is made with the next preceding similar study of ___ . The heart size is within normal limits . The thoracic aorta is mildly elongated . 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 . Skeletal structures of the thorax are grossly unremarkable . No evidence of pneumothorax in the apical area on the frontal view .
    OUTPUT:
    
Stable normal chest findings . No evidence of cardiac enlargement , pulmonary congestion , or acute infiltrates .