Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is normal . Mediastinal and hilar contours are within normal limits . The pulmonary vasculature is not engorged . Consolidative opacity in the left lower lobe is compatible with an area of pneumonia . A small pleural effusion is also demonstrated . The right lung appears clear . No pneumothorax is identified . Moderate degenerative changes are seen within the thoracic spine .
    OUTPUT:
    
Consolidative left lower lobe opacity compatible with pneumonia . Small left pleural effusion . Follow up radiographs are recommended after treatment to ensure resolution of these findings .