MRI data of patient 1 (a, b) and patient 2 (c, d). Saggital (a) and axial (b) T2-weighted magnetic resonance images show increased signal intensity in the spinal cord of patient 1. The lesion extends from the T5 to the T10 vertebral body. The axial image shows the spinal cord at the level of the T6 vertebral body. (c) T2-hyperintense lesion on the level of the C4 vertebral body of patient 2. (d) Brain-MRI shows a single T2-hyperintense paraventricular left hemispheric lesion in patient 2.