Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared to the prior study , lung volumes are low and there is now a small left pleural effusion . There is no focal consolidation or pneumothorax . The cardiomediastinal silhouette is unremarkable . A G - tube is partially imaged . Bony structures are intact .
    OUTPUT:
    
Small left pleural effusion . No pulmonary edema .