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 is unchanged and remains within normal limits . Unremarkable appearance of thoracic aorta . No mediastinal abnormalities are seen . 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 the apical area . Unremarkable appearance of thoracic spine on lateral view with minimal degenerative changes . When comparison is made with the next previous examination , there is no evidence of any new pulmonary infiltrate , nor is there evidence of pulmonary congestion or pleural effusion .
    OUTPUT:
    
Stable normal chest findings . No evidence of pneumonia .