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FIG 1. Patient 16 (nonrecurrence group).
A–C, Gadolinium-enhanced T1-weighted (400/14) (A), FLAIR (10,002/175/2200) (B), and DW echo-planar (10000/114.5, b = 1000 s/mm2) (C) representative axial MR images obtained at follow-up after radiation therapy show a small periventricular enhancing lesion in the left frontal lobe, with a surrounding area of T2 prolongation on the FLAIR image consistent with perifocal edema. Postsurgical changes include an area of prior resection of the primary neoplasm (anaplastic astrocytoma) in the left frontal lobe. Enhancement resolved after hyperbaric oxygen therapy.
D, ADC map from the DW image (b = 0, 1000 S/mm2). This patient from the nonrecurrence group exhibited a mean ADC in the enhancing lesion of 1.33 x 10-3 mm/s2, a mean ADC in T2 prolongation of 0.91 x 10-3 mm/s2, and a normalized ADC ratio of the enhancing region of 1.87. X indicates ROI of the enhancing lesion; Y, ROI in T2 prolongation.
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