Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal upright portable chest radiograph demonstrates unchanged appearance of a right dual - lumen dialysis catheter , the tip of which projects over the right atrium . There is no pneumothorax . Lung volumes remain low , with bibasilar atelectasis . The cardiac silhouette and mediastinal contours remain widened . Pulmonary vasculature is normal , there is no pulmonary edema . Bilateral pleural effusions are small , if any .
    OUTPUT:
    
1 . No pneumothorax . 2 . Low lung volumes with small bilateral pleural effusions .