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 is normal in size and does not show any configurational abnormality . Thoracic aorta and mediastinal structures are unremarkable . 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 on the frontal view . Skeletal structures of the thorax remain within normal limits .
    OUTPUT:
    
No evidence of cardiac enlargement , pulmonary congestion , or acute infiltrates . Chest findings remain normal and have not undergone any significant interval change since a previous examination of ___ .