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FIG 2. Follow-up MR imaging performed on a 3.0-T system approximately 8 weeks after discontinuation of metronidazole. FLAIR image (A) and corresponding T2-weighted spin-echo image (B) demonstrate near-complete resolution of previously noted areas of signal intensity abnormality (Fig 1). The observed low signal intensity within the dentate nucleus is normal and related to increased susceptibility effects at 3.0 T, which increases proportional to the square of the main magnetic field strength. The DW image (C) and ADC map (D) have also normalized in the interim. Quantitative ADC measurements (D) now demonstrate an ADC value of 739 x 10-6 mm2/s, which is within normal limits.
