[Cerbral salt wasting syndrome versus SIADH].

In the context of cerebral diseases the two main mechanisms responsible for non iatrogenic causes of hyponatremia are cerebral salt wasting syndrome (CSW) and inappropriate secretion of antidiuretic hormone (SIADH). Distinction between these two syndromes is difficult and is based on the assessment of the patient's volume status. In case of CSW, the volume status is low and the treatment is fluid and sodium replacement.