Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Moderate left pleural effusion extending from the cardiac silhouette to the left costal pleural surface , and posterior to the left lung , is entirely unchanged since ___ . Superiorly the left lung is clear . Right is fully expanded and there is no right pleural effusion . The heart is probably not enlarged .
    OUTPUT:
    
Loculated moderate left pleural effusion which developed between ___ and ___ has not changed over the past week .