Brachial diplegia in central pontine myelinolysis.

A patient developed weakness in the upper limbs, eventually causing brachial diplegia with only slight paresis of the legs after rapid correction of severe hyponatraemia. Pseudobulbar palsy, mental confusion and urinary incontinence were also present. CT scan showed a zone of lucency in the pons. Clinical recovery occurred and the zone of lucency had disappeared 12 months after the appearance of the neurological signs.