Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs again demonstrate a dialysis catheter with the tip in the right atrium . The cardiomediastinal silhouette is unchanged , demonstrating mild cardiomegaly . Lung volumes are low , accentuating lung markings with superimposed vascular congestion , but no focal opacity . No large recurrent pleural effusion or pneumothorax .
    OUTPUT:
    
Low lung volumes with superimposed vascular congestion , without focal opacity or large recurrent pleural effusion .