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Fig 2. A, Corticospinal tract tractography. Patients were classified into 1 of 3 groups based on the distance between AVM nidus and tract and the presence of motor weakness. Three groups (A–C) are assigned from top row to bottom row. Left column displays transverse b = 0 images (TR/TE, 7000 ms/79 ms). Blue areas represent the voxel where fiber tracts penetrate the image. Middle column displays transverse maximum intensity projection (MIP) images of MR angiography. Red arrows indicate AVM nidus. Right column displays 3D reconstruction of fibers and MR angiography superimposed on b = 0 images. 3D reconstructions of AVM nidus (red) and hemorrhage (yellow) segmented from MR angiography were displayed by using shaded surface rendering. Patients in groups A and B are subjects without hemorrhage, and the group C patient is a subject with hemorrhage in this figure. In this group C patient, left corticospinal tract veers laterally, and projection fibers from the medial precentral gyrus are not visualized (green arrow).
B, Optic radiation tractography. Patients were classified into 1 of 3 groups based on the distance between AVM nidus and tract and the presence of visual field defect. Optic radiation tractography is represented in green, and imaging methods are the same as explained in A. The group B patient is the same as the group A patient presented in A. In this group C patient, left optic radiation was disrupted around the occipital pole.
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