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Table 2: Spinal MRI findings in AQP4 antibody–positive and –negative groups^{^a}
Imaging Features AQP4 Antibody–Positive Group (n = 15) AQP4 Antibody–Negative Group (n = 26)
Cervicomedullary junction involvement 9 (60%) 6 (23%)
    Medulla oblongata involvement 4 (27%) 1 (4%)
Cord expansion ratio (mean) (onset ≤2 months)^{^b} 1.35 ± 0.15 1.24 ± 0.15
Cord expansion ratio (mean) (onset ≤15 days)^{^c} 1.34 ± 0.17 1.24 ± 0.17
Bright spotty lesion 
    Negative 1 (7%) 18 (69%)
    Positive 14 (93%) 8 (31%)
Involved segment 
    Cervical 5 (33%) 7 (27%)
    Cervicothoracic 8 (53%) 5 (19%)
    Thoracic 2 (13%) 10 (38%)
    Thoracolumbar 0 (0%) 1 (4%)
    Holocord 0 (0%) 3 (12%)
No. of segments involved (mean) 9 ± 4 7 ± 4
Axial distribution 
    Central 10 (67%) 21 (81%)
    Peripheral 4 (27%) 4 (15%)
    Both 1 (7%) 1 (4%)
>Half of the cord area 12 (80%) 24 (92%)
Enhancement 
    No enhancement 4 (27%) 6 (23%)
    <50% enhancement 9 (60%) 17 (65%)
    >50% enhancement 0 (0%) 0 (0%)
    Not available 2 (13%) 3 (12%)
↵a Data are number and percentage unless otherwise indicated.
↵b Cord expansion ratio was measured only for 32 patients.
↵c Cord expansion ratio was measured only for 22 patients.