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 size remains normal . No configurational abnormality is seen . Very mild widening and elongation of the thoracic aorta but no evidence of any local contour abnormality . 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 .
    OUTPUT:
    
Stable normal chest findings . No evidence of acute pulmonary infiltrate or pulmonary vascular congestion .