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 portable chest examination of ___ . There is marked improvement of lung ventilation with now much improved aeration of the basal segments of the lung . The heart size can now be seen to be well within normal limits and no configurational abnormality is identified . The degree of mild elongation and widening of the thoracic aorta in this elderly male patient is not excessive and no local abnormal aortic bulges can be identified . The pulmonary vasculature is not congested . The left lung base is free with well - delineated diaphragmatic contours and absence of any acute infiltrates . On the right base , there is still a pleural density obscuring partially the diaphragmatic contour and blunting the lateral and posterior pleural sinus . A linear atelectasis is present on the right base , but again the findings are much improved . The previously existing pigtail and pleural drainage tube has been removed , a biliary drainage tube remains unchanged . On the frontal view , there is no evidence of any pneumothorax in the apical area .
    OUTPUT:
    
Marked improvement of previously described pleural and chest wall densities . No cardiac enlargement or pulmonary congestion . No pneumothorax .