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Fig. 1A. —Typical wafer appearance in 73-year-old man who underwent resection of anaplastic astrocytoma with placement of N, N' 1, 3-Bis-(2-chloroethyl)-N-nitrosourea (BCNU) polymer wafer. Axial T1-weighted MR image obtained 1 day after wafer placement shows that wafers (arrows) are linear and of low signal intensity.