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[Excessive water intake with intoxication as a manifestation of anorexia nervosa].

A case of anorexia nervosa revealed by water intoxication with severe hyponatremia is reported after a search of the literature demonstrated the rarity of such cases. Pathophysiological mechanisms involved are discussed. Hospitalization in a unit for adolescents in which pediatricians and psychiatrists work together allowed both prompt treatment of metabolic disorders and early management of anorexia nervosa, which is associated with improved prognosis.