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Fig. 3B. —Perirolandic myelination in normal fetus at 33 weeks' gestation. Magnified axial fast MR image with steady-state free precession at same level as A clearly shows early perirolandic myelination as hypointense signal (arrowheads). Note that fat-water boundary was conspicuously delineated in this image because of out-phase nature of TE (2.3 msec) in gradient-echo images.