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 not engorged . Consolidative opacity in the left upper lobe is highly concerning for pneumonia . The right lung is clear . No pleural effusion or pneumothorax is visualized . There are multilevel degenerative changes seen within the thoracic spine as well as within the imaged right acromioclavicular joint .
    OUTPUT:
    
Left upper lobe pneumonia . Follow up radiographs are recommended after treatment to ensure resolution of this finding .