Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest views have been obtained with patient in upright position . Analysis is performed in direct comparison with the next preceding similar study of ___ . Moderate cardiac enlargement remains . The cardiac contours demonstrating a relative prominence of the left ventricular contour to the left and posteriorly . The thoracic aorta is moderately widened and elongated as before . No local contour abnormalities are present . The pulmonary vasculature demonstrates an upper zone re-distribution , but no evidence of interstitial or alveolar edema . On the left base in retrocardiac space , a crowded pulmonary vasculature is observed on the lateral view , partially obscuring the diaphragmatic contour . The lateral view discloses a hazy parenchymal infiltrate occupying the posterior segment of the left lower lobe without evidence of coinciding pleural effusion . This local parenchymal density was not present on the lateral view of the preceding examination of ___ . Moderate cardiac enlargement and the upper zone re-distribution pattern existed already earlier .
    OUTPUT:
    
New discrete pulmonary parenchymal infiltrate occupying left lower lobe posterior segment consistent with the diagnosis of pneumonia . Referring physician , ___ . ___ was informed via page at 2 :45 p .m .