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Fig 3. Right temporal lobe epilepsy. Anterior temporal lobectomy was performed. A, Presurgical tractography. Tractography of the Meyer loop is shown as the green tract. T-M distance is 35.6 mm. Uncinate fascicles are shown in the yellow tract. Note that there is no gap between the 2 tractographies. B, Postsurgical spin-echo sagittal image. An anterior temporal lobectomy has been performed. The T-R distance is 38 mm (arrow). Because the T-M distance is 35.6 mm on the presurgical tractography, the M-R distance is calculated to be +2.4 mm. C, For the postsurgical tractography, the Meyer loop could not be delineated; thus, only the dorsal optic radiation could be drawn. D, The visual field 2 months after the surgery. There is a complete visual field defect in the medial sector and a partial visual field defect in the lateral sector of the lateral upper quadrant visual field.
