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Figure 1: Axial MR images showing: (A) white matter lesions (FLAIR), (B) basal ganglia and thalamic lesions (T2-weighted), (C) brain stem lesions (T2-weighted), and (D) multiple lesions showing ring enhancement after gadolinium administration; arrow indicates the ‘open-ring sign.’

Figure 1: Axial MR images showing: (A) white matter lesions (FLAIR), (B) basal ganglia and thalamic lesions (T2-weighted), (C) brain stem lesions (T2-weighted), and (D) multiple lesions showing ring enhancement after gadolinium administration; arrow indicates the ‘open-ring sign.’