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Possible nonenhancing tumor vs gliosis or edema. Axial T2-weighted images following surgical resection and chemoradiation (white arrows) of a left frontal anaplastic astrocytoma (A) with follow-up imaging performed 1 year (B) and 1-1/2 years (C) later demonstrate a slight increase in the amount of T2 hyperintensity along the lateral margin of the resection site (darker arrow in C), which may represent gliosis or edema. However, nonenhancing recurrent tumor cannot be excluded.
