Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left lower lobe opacity is new since ___ . In addition , there is a possible lingular opacity . No pulmonary edema , pleural effusion or pneumothorax identified . The cardiac and mediastinal contours are stable .
    OUTPUT:
    
Left lower lobe opacity is concerning for pneumonia in the appropriate clinical setting . Followup radiographs in 4 weeks are recommended to document resolution .