Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Focal opacification of the left lower lobe is concerning for pneumonia . Linear opacities in the lingula and right lung base are compatible with areas of subsegmental atelectasis . A small left pleural effusion is noted . The cardiac and mediastinal contours are unchanged and the heart size within normal limits . The pulmonary vasculature is not engorged . No pneumothorax is present . There are no acute osseous abnormalities visualized .
    OUTPUT:
    
1 . Left lower lobe pneumonia with small left pleural effusion . Followup radiographs after treatment are recommended to ensure resolution of these findings . 2 . Bibasilar subsegmental atelectasis .