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Diffusion tractography of the optic radiations (in red) superimposed on axial (A), sagittal (B), and 3-dimensional composite (C) b = 0 sec/mm2 images of a child with NF1-OPG. Decreased diffusion along these tracts may reflect white matter damage. NF1, neurofibromatosis type 1; OPG, optic pathway glioma.
