Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The right chest wall power injectable port , the tip projecting over the superior cavoatrial junction . Low bilateral lung volumes with a persisting retrocardiac opacity silhouetting the left hemidiaphragm as well as small left pleural effusion . No pneumothorax identified . The size of the cardiac silhouette is enlarged but unchanged . Sclerosis of both humeral heads is again seen , consistent with the patient 's known osteoblastic metastatic disease .
    OUTPUT:
    
Persisting retrocardiac opacity and small left pleural effusion .