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 ___ ___ . The heart size remains unchanged and is within normal limits . No typical configurational abnormality is seen . Mild widening and elongation of the thoracic aorta is noted as before . No local contour abnormalities are seen . The pulmonary vasculature is not congested . There is now a sizable parenchymal infiltrate occupying the left upper lobe as seen on the frontal view . The lateral view discloses its location in the posterior apical segment of the left upper lobe sparing ; however , the lingula . No other pulmonary acute processes are seen and the right and left lateral as well as posterior pleural sinuses are free from any fluid accumulation . Similar as on the preceding examination , the general configuration of pulmonary vasculature and thorax with increased depth diameter and low positioned diaphragms is consistent with COPD .
    OUTPUT:
    
Development of acute parenchymal infiltrate in left upper lobe lateral and apical segment consistent with pneumonia . Followup examination after successful treatment is recommended .