Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a fan shaped opacity in the left upper lobe consistent with pneumonia . Moderate - sized left pleural effusion is essentially unchanged from prior study . There are no other areas of focal consolidation suspicious for infection . There is no pneumothorax . The cardiomediastinal silhouette is stable and top normal in size .
    OUTPUT:
    
Left upper lobe pneumonia .