Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well expanded and show a left perihilar alveolar opacity , with air bronchograms , in the upper lobe . The cardiomediastinal silhouette , hilar contours , and pleural surfaces are normal . No pleural effusions or pneumothorax is present .
    OUTPUT:
    
Left upper lobe opacity consistent with pneumonia . Recommend follow - up radiograph after treatment and resolution of symptoms to confirm resolution of the radiographic findings .