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 normal . No configurational abnormality is seen . Thoracic aorta is unremarkable . No mediastinal abnormalities are present . The pulmonary vasculature is not congested . No signs of acute or chronic parenchymal infiltrates can be identified and the lateral and posterior pleural sinuses are free . No significant interval change in comparison with the previous study .
    OUTPUT:
    
No evidence of acute pneumonia .