Fig. 1

MRI findings in GFAP-IgG, AQP4-IgG and MOG-IgG myelitis. Sagittal and axial sections showed longitudinally extensive T2 lesions (A and B), punctate enhancing lesions mainly located at central canal with or without linear pia and leptomeningeal enhancement (C and D) and linear perivascular radial gadolinium patterns (E and F) in patients with GFAP-IgG myelitis. Lesions in AQP4-IgG myelitis were generally more well-defined, accompanied by axial T2-hyperintensity lesions (G) with ring enhancement (H). Longitudinally extensive T2 lesions (I) and typical “H sign” (H, bottom panels) were detected in MOG-IgG myelitis patient (the yellow lines indicated the sagittal level at which the axial images below are located)