Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is normal . The mediastinal and hilar contours are unremarkable . The pulmonary vascularity is normal . Consolidative opacity in the left upper lobe is concerning for pneumonia . The right lung is clear . No pleural effusion or pneumothorax is present . There are no acute osseous abnormalities .
    OUTPUT:
    
Left upper lobe pneumonia . Followup radiographs after treatment are recommended to ensure resolution of this finding .