Figure 1 (A) Coronal and sagittal sections of gadolinium‐enhanced T1‐weighted spinal magnetic resonance image showing symmetrical contrast enhancement of the lateral aspects of the spinal cord. Asterisk indicates TH12. Dashed line indicates the level of axial section. (B) Clinical course of the patient starting from May 2003. Continuous line with closed boxes: white blood cells (WBCs (cells/µl), left y axis, normal <5/µl) in the cerebrospinal fluid; dashed line with filled circles: QAlb×103 (albumin ratio serum/cerebral spinal fluid as a parameter of blood brain–barrier function, left y axis, normal <8.4); dashed line with filled triangles: differences of left peroneal somatosensory evoked potential (SEP) latencies compared with those from November 2003 (ms, right y axis). Encircled numbers: numbered clinical relapses; open arrows: cyclophosphamide pulses; line of asterisks: steroid treatment, roughly corresponding in size of dose; filled line above asterisks: azathioprine treatment.