The overnight 1-mg dexamethasone suppression test is a very good screening test for subjects suspected of having Cushing's syndrome. To simplify the procedure, we evaluated the 1-mg dexamethasone suppression test with measurement of salivary cortisol. We performed this test with plasma and salivary cortisol measurements in 27 patients with Cushing's syndrome and 64 normal controls. The sensitivity and specificity of plasma cortisol measurements were 100% and 87%, respectively, for a cut-off point of 100 nmol/l, in accordance with previous studies. The results of salivary cortisol showed the absence of overlap between the two groups, with a sensitivity and specificity of 100% for a cut-off point of 2.8 nmol/l. On a larger series, however, one might occasionally miss the diagnosis of a patient with Cushing's syndrome. Therefore, we favor a cut-off point of 1.9 nmol/l, the sensitivity remaining at 100% and the specificity being 94%. In conclusion we recommend the overnight dexamethasone suppression test with measurement of salivary cortisol as a screening test for Cushing's syndrome.
L'adénome à prolactine est rare chez la femme âgée. Le tableau clinique peut être confondu avec les manifestations de la ménopause, rendant son diagnostic parfois difficile. Nous rapportons une observation sur les particularités d'un micro adénome à prolactine survenant chez une femme âgée de 57 ans, qui a présenté une aménorrhée secondaire sans bouffées de chaleur associée à une galactorrhée évoluant depuis 2 ans. L’examen physique confirme la galactorrhée et la biologie montre une hyperprolactinémie à 2735 mUI /L, FSH = 15,1 UI/L et LH = 4,1UI/L. L’IRM hypophysaire montre un adénome gauche de 8mm. L'évolution sous traitement dopaminergique était marqué par la reprise transitoire des cycles et apparition de bouffées de chaleur, normalisation de la prolactinémie et diminution de la taille de l'adénome.
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