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 remains normal in size . No configurational abnormality is seen . Thoracic aorta unremarkable . No mediastinal abnormalities are present . The pulmonary vasculature is normal . No signs of acute or chronic parenchymal infiltrates are present and the lateral and posterior pleural sinuses are free . No evidence of pneumothorax in the apical area . Skeletal structures of the thorax remain grossly unremarkable .
    OUTPUT:
    
Stable normal chest findings , thus no evidence for acute pulmonary parenchymal infiltrates or chronic scar formations .