1. From the Departments of Radiology (F.M.A.C., L.B.Q.R., S.d.M.A., M.d.S.R., F.I.Y., P.C.C.V.) and Radiation Therapy (C.T.M.M., G.P.M.), University of São Paulo, Rua Dr. Ovídio Pires de Campos 75, 05403-010, Cerqueira César, São Paulo-SP, Brazil; and Department of Radiology, Sírio-Libanês Hospital, São Paulo, Brazil (P.S.B.P.).