1. From the Department of Radiology, Hospital Sirio-Libanes, Rua Adma Jafet, 91, Sao Paulo, SP 01308-050, Brazil (M.V.S.F., C.S.P.S., J.dA.B.A.F., R.N.D., R.V.A.T., T.C.M., L.F.R.A., C.H.N., J.P.F.); Department of Radiology, Hospital Israelita Albert Einstein, Sao Paulo, SP 05652-900, Brazil (W.I.); and Department of Radiology, Mayo Clinic, Rochester, MN 55905 (P.S.R.).