1. From the Departments of Radiology (Y.S., Ying Liu, Yanqing Liu, Q.G.), Pancreato-thyroidic Surgery (F.G.), and Pathology (Yue Li), Shengjing Hospital, China Medical University, No. 36 Sanhao St, Heping District, Shenyang 110004, P.R. China; and Department of Radiology, Mayo Clinic, Rochester, Minn (S.T., K.J.G., R.L.E.).