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 chest examination of ___ . The heart size is unchanged and remains within normal limits . Unremarkable appearance of the thoracic aorta . The pulmonary vasculature is not congested . There exists now a parenchymal infiltrate in the lateral superior segment of the left upper lobe . It projects in dorsal direction on the lateral view . No other acute parenchymal infiltrates are seen and the pleural spaces are free . On the previous examination of ___ , the patient had a left basal linear atelectasis which now has resolved . The now present infiltrate in the left upper lobe lateral segment was not present .
    OUTPUT:
    
New pneumonic infiltrate in left upper lobe . Followup examination is recommended .