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 chest examination of ___ . The heart size is unchanged and remains within normal limits . Normal appearance of thoracic aorta and mediastinal structures . 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 apical area on frontal view . Skeletal structures of the thorax grossly unremarkable . In comparison with the next previous chest examination , no significant interval change can be identified .
    OUTPUT:
    
Chest findings are within normal limits . Thus , no evidence of acute pneumonic infiltrates .