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 . No configurational abnormality is identified . The thoracic aorta is unremarkable . The pulmonary vasculature is not congested . No signs of acute or chronic parenchymal infiltrates are present and the pleural sinuses are free . No pneumothorax in apical area . The skeletal structure is grossly within normal limits . When comparison is made with the next preceding examination of ___ , no significant interval change can be identified .
    OUTPUT:
    
Persistent normal chest findings , no evidence of acute infection .