1. From the Departments of Urology (D.M.D.), Radiology (J.F.S.), Medicine (O.I., P.J.S.), and Pathology (C.-L.W.), Massachusetts General Hospital, and the Departments of Surgery (D.M.D.), Radiology (J.F.S.), Medicine (O.I., P.J.S.), and Pathology (C.-L.W.), Harvard Medical School — both in Boston.