Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A portable frontal chest radiograph demonstrates a right pigtail catheter within the right pleural fluid collection which is likely unchanged in size , allowing for changes in patient position . The remainder of the exam is unchanged , including retrocardiac atelectasis . The cardiomediastinal silhouette is similar in appearance . There is no pneumothorax .
    OUTPUT:
    
Unchanged chest radiograph demonstrating a moderate right pleural effusion .