Central pontine myelinolysis (CPM) is an uncommon neurological syndrome that is usually related to the rapid restoration of a previous hyponatraemia. Although the most frequent location of CPM injury is the pons, it is now designated osmotic demyelination syndrome (ODS) because, as well as in the brainstem, these injuries can be observed in other parts of the central nervous system (CNS)–for example, the thalamus, subthalamic nucleus, external geniculate body, putamen, globus pallidum, internal capsule, white matter of cerebellum and the deep layers of the brain cortex. However, an exhaustive search of the literature (MEDLINE 1967–2007) has revealed no case report of peripheral nervous system (PNS) demyelination secondary to severe hyponatraemia.
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Competing interests: None.