Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is normal . Mediastinal and hilar contours are normal . Pulmonary vasculature is normal . Patchy ill - defined opacities are seen within the left lower lobe concerning for pneumonia . Right lung is clear . No pleural effusion or pneumothorax is present . No acute osseous abnormality is visualized .
    OUTPUT:
    
Ill - defined patchy left lower lobe opacities concerning for pneumonia . Followup radiographs after treatment are recommended to ensure resolution of this finding .