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Classification of syringomyelia (SM). (A, D) SM0 = normal—no SM, (B, E) SM1 = abnormal—symmetric (i.e., circular, round syrinx), (C, F) SM2 = abnormal—asymmetric (e.g., syrinx extending into a dorsal horn). (A–C) T2-weighted magnetic resonance images, transverse. (D–F) T1-weighted magnetic resonance images, transverse.
