AQP4 and transverse myelitis: BSLs may facilitate the discrimination of NMOSD from other LETM etiologies (reported specificity up to 98.5% and positive predictive value up to 86.1% in anti-AQP4 seropositive patients).87,88 However, rarely BSLs can occur with other causes of transverse myelitis, including cases of MS89 and MOGAD (Figure 2c).20 Thus it is imperative to consider all features on spinal cord MRI, including the lesion length on sagittal sequences and central versus peripheral localization on axial images.