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MRI of patient 1 showing posterior column hyperintensity (white arrow and arrowhead) of cervical spinal cord in T2 axial (a) and T2 midsaggital (b) sections. MRI of patient 4 showing classical ‘V’ sign (black arrowhead) in T2 axial image (c) with longitudinal posterior cervical spinal cord hyperintensity (black arrow) in T2 midsaggital sections (d).
