Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is persistent left lower lobe and retrocardiac opacity similar to the outside radiograph of ___ but worse since ___ likely reflecting combination of consolidation and small effusion . The right lung appears clear . There is no pulmonary edema . Heart size is normal . The mediastinal and hilar contours are normal . There is no pneumothorax .
    OUTPUT:
    
Left lower lobe opacity and small pleural effusion unchanged since outside study of ___ . Although findings could reflect pneumonia , pulmonary embolism should also be considered .