Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is worsened opacification in the superior segment of the left lower lobe compatible with pneumonia as demonstrated one day prior . There is no evidence of increased associated effusion . There is no evidence of pneumothorax . The remainder of the lungs are clear with no evidence of multifocal spread . The cardiomediastinal and hilar contours are stable demonstrating mild tortuosity of thoracic aorta . Heart size is normal . Pulmonary vascularity is within normal limits .
    OUTPUT:
    
Left lower lobe pneumonia . No evidence of increased associated effusion .