J Med Assoc Thai 2011; 94 (1):27

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Optic-Spinal Inflammatory Demyelinating Disease: (OS-IDD) patients in Siriraj Hospital
Chotik-anuchit S Mail, Siritho S , Tritrakarn S , Chawalprit O , Prayoonwiwat N

Objective: To study the demographic data of optico-spinal inflammatory demyelinating disease (OS-IDD) patients at SirirajHospital between January 1997 and October 2006
Design: Retrospective study of OS-IDD patients.
Results: There were 84 OS-IDD patients. Cerebrospinal fluid analysis revealed higher white blood cell count and neutrophiliain neuromyelitis optica (NMO) patients than those of multiple sclerosis (MS) patients. NMO had an average length of 4.1segments of the cervical and 6.5 segments of thoracic cord involvement.
Conclusion: Among Thai OS-IDD patients, on the basis of clinical features, NMO was hardly differentiated from MS.
Keywords: Optico-spinal inflammatory demyelinating disease (OS-IDD), Multiple sclerosis, Neuromyelitis optica, Thai,Optic neuritis, Myelitis

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