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Figure 1: (a) Sagittal T1-weighted magnetic resonance image showing “tadpole” atrophy of brainstem; i.e., atrophy of medulla oblongata and cervical cord (arrowhead) with preserved basis pontis (arrow). (b) Axial T2 sequence showing marked atrophy of medulla oblongata (arrows)

Figure 1: (a) Sagittal T1-weighted magnetic resonance image showing “tadpole” atrophy of brainstem; i.e., atrophy of medulla oblongata and cervical cord (<i>arrowhead</i>) with preserved basis pontis (<i>arrow</i>). (b) Axial T2 sequence showing marked atrophy of medulla oblongata (<i>arrows</i>)