1. From the Departments of Surgery (N.N.S., P.J.F.), Radiology (A.K.), Obstetrics and Gynecology (R.L.), and Pathology (M.K.-W.), Massachusetts General Hospital, and the Departments of Surgery (N.N.S., P.J.F.), Radiology (A.K.), Obstetrics and Gynecology (R.L.), and Pathology (M.K.-W.), Harvard Medical School — both in Boston.