FIG 4. Case 8, a 49-year-old man.

A and B, T2-weighted image. The patient had left anterior temporal lobectomy (A), and there is a high signal intensity area in the anterior part of left sagittal stratum (B, arrow). C, Visual field. The upper quadrant visual field is completely impaired. D, Color-displayed tensor image. Sagittal strata including the optic radiation were recognized as a green area even in operated side. Regions of interest for measurement are shown as dotted lines. E, FA image. The FA value of the left sagittal strata shows a noticeably lower value as compared with the opposite side (right, 0.506; left, 0. 394). F, ADC image. No apparent difference between the optic radiations of both sides is observed (right, 6.10 x 10^–4 mm²/s; left, 7.00 x 10^–4 mm²/s).