1. From the Department of Radiology, Instituto Nacional de Câncer (INCA), Praça Cruz Vermelha 23, Rio de Janeiro, RJ, Brazil 20230-130 (R.C., J.A., C.A.d.A., R.P.S., M.F.U., A.P.K.C., G.S.M., G.R.S.d.N., F.M., M.D.); and Department of Radiology, Medical College of Wisconsin, Milwaukee, Wis (M.A.).