“…It is not surprising, therefore, that pure water retention without significant sodium depletion can occur in hypopituitarism. That it may not be uncommon is suggested by reports of very low plasma sodium concentrations, without evidence of dehydration or crisis, in patients with this conditionfor example Bartter et al (1950), Waterhouse et al (1952, Peters et al (1954), andAber et al (1954)-a state of affairs which has usually been attributed to sodium depletion.…”