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CASE REPORTS
JOURNAL ARTICLE
Expanding the range of immunopathology in neuromyelitis optica spectrum disorder.
BMJ Case Reports 2016 July 29
Neuromyelitis optica (NMO) spectrum disorder typically associates with a pathognomonic antibody response directed against aquaporin 4 and a unique immunopathological signature characterised by loss of aquaporin 4 expression. We describe a tumefactive presentation of NMO in which a biopsy specimen demonstrated active demyelination and reactive astrocytes with preserved surface aquaporin 4 immunoreactivity and dystrophic processes. While the astrocytic pathology is more typical of classical multiple sclerosis, a positive NMO-IgG (1:80) and subsequent clinical presentation with an area postrema syndrome is consistent with a diagnosis of NMO spectrum disorder. This report expands the immunopathological features that have been reported in NMO spectrum disorder.
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