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Fig. 1B. —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 unenhanced CT scan obtained 2 weeks after surgery shows radiodense wafers (straight arrows) and gas in surgical bed (curved arrow). Gas in surgical bed was gone by next scan that was obtained 6 weeks later (not shown).

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