FIG 3. Case 9, a 44-year-old man.

A and B, T2-weighted image. The patient had a left temporal lobectomy (A). No abnormal signal intensity can be seen along the sagittal stratum (B). C, Visual field. The medial sector of the upper quadrant visual field is completely impaired, and partial impairment in the lateral sector area can be seen. D, Color-displayed tensor image. Sagittal strata are recognized as a green area, which indicates an anterior to posterior directed tract. Regions of interest for measurement of ADC and FA values are shown as dotted lines. E, FA image. The FA value of the left optic radiation shows a lower value as compared with the opposite side (right, 0.526; left, 0.488). F, ADC image. There is no apparent difference between the optic radiations of both sides (right, 6.20 x 10^–4 mm²/s; left, 6.10 x 10^–4 mm²/s).