Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Right - sided tunneled venous catheter seen with distal tip in the right atrium . There a large right pleural effusion , not significantly changed since prior . The left lung is grossly clear . Cardiac silhouette is stable . No acute osseous abnormalities . No pneumothorax .
    OUTPUT:
    
Persistent large right pleural effusion . No superimposed acute cardiopulmonary process .