A 36-year-old woman was admitted to our hospital because of progressive numbness of her extremities and trunk. She was asymptomatic until approximately 1 month prior to admission, when she developed numbness in her left arm and hand. Two weeks before admission, she experienced neck pain and dysuria. Over the next 2 weeks, the numbness gradually progressed to her left lower extremity, right extremities, and trunk. She experienced no visual disturbances, and took no medications. Her past medical and family histories were unremarkable. She had no history of gastritis, gastrectomy, or other gastrointestinal disorders. She was not a vegetarian and her diet was unremarkable. On admission, the patient was well nourished with a body mass index of 21.5. A general medical examination revealed no abnormalities. Neurological examination showed positive Lhermitte’s phenomenon, and dysesthesia in the upper limbs and below the thoracic 6th dermatome. She demonstrated moderately decreased vibration sensation. The reflexes of both upper limbs were decreased while those of both lower limbs were increased. There were no pathological reflexes. The remainder of the neurological examination was normal. Initial routine laboratory examinations were unremarkable. A complete blood count showed no anemia and normocytosis. Biochemical examination of the blood revealed no abnormalities. Additional laboratory data were as follows: antinuclear antibodies, negative; vitamin B12, 96 pg/dL (233–914); folate, 3.1 ng/dL (3.6–12.9); serum copper, 48 lg/dL (70–132); serum ceruloplasmin, 12.2 mg/dL (21–37); urine copper, 56 lg/L (14–63); gastric parietal cell antibodies, negative; anti-intrinsic factor antibodies, negative. Anti-aquaporin 4 (AQP4) antibodies were found to be positive using the cell-based assay described in Ref. [1]. Cerebrospinal fluid (CSF) examination showed no leukocytosis, a protein level of 27 mg/dL (\40), albumin ratio of 4.9 (CSF albumin, 18.9 mg/dL; serum albumin, 3,840 mg/dL), no oligoclonal bands, and normal levels of myelin basic protein. T2-weighted magnetic resonance images (MRIs) of the cervical spinal cord showed hyperintensity in the posterior columns extending from the level of C2 to C6, and in the spinal cord around the central canal from the level of C4 to C7. Both types of spinal cord lesions were present between C4 and C6 (Fig. 1). Left median nerve somatosensory evoked potential (SEP) showed no detectable N11 or P13/14 components, with abnormally extended latency between N9 and N20 onsets (9.54 ms; normal range, under 8.10 ms) (Fig. 2). The patient was diagnosed with NMO spectrum disorder (NMOSD) with concurrent subacute combined degeneration (SCD). We performed steroid pulse therapy (methylprednisolone 1 g, 3 days) and replacement therapy with vitamin B12. These treatments improved the patient’s trunk and right hand numbness and she was discharged 32 days after admission. N. Ishii H. Mochizuki (&) K. Shiomi M. Nakazato Division of Neurology, Respirology, Endocrinology and Metabolism, Department of Internal Medicine, University of Miyazaki, 5200 Kibana, Kiyotake, Miyazaki 889-1692, Japan e-mail: mochizuki-h@umin.ac.jp
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