Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest views were obtained with patient in upright position . Heart size is normal . No configurational abnormality . Thoracic aorta unremarkable . No mediastinal abnormalities . The pulmonary vasculature is normal . No signs of acute or chronic parenchymal infiltrates are present and the lateral and posterior pleural sinuses are free . Skeletal structures of the thorax grossly within normal limits . Comparison is made with the next preceding chest examination ___ ___ . At that time , the chest findings are grossly normal , but a subtle small suspicious parenchymal infiltrate was noted localized to the right base in posterior position . This suspicious infiltrate does not exist anymore .
    OUTPUT:
    
Normal chest findings .