Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left lingular and lower lobe airspace opacity is concerning for pneumonia . Linear opacities at the right lung base likely represent atelectasis . No pleural effusion or pneumothorax . The cardiac and mediastinal contours are stable . Pulmonary vasculature is normal .
    OUTPUT:
    
Left basilar opacity concerning for pneumonia . Follow up radiographs after treatment are recommended to assess for resolution of this finding .