[Pituitary metastasis of a small cell bronchial carcinoma responsible for diabetes insipidus and disclosed by corticosteroid therapy].

We report a case of deficient anti-diuretic hormone masked by an associated deficiency of the corticotrophine due to hypophysial metastasis from a small cell carcinoma of the bronchus. Steroid therapy used as an anti-emetic revealed the diabetes insipidus. There was a favourable outcome to chemotherapy.