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Case 3. Preferential infusate flow along parallel white matter tracts. A–D: Serial axial T1-weighted MR images acquired every 50 minutes, demonstrating preferential infusate flow in the white matter tracts of the brainstem in the axial plane. The serial images demonstrate preferential spread of infusate along the horizontal fibers of the pons that initially preserve the perpendicularly oriented corticospinal tracts.
