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Virilizing Adrenal Adenoma Stimulated by Dexamethasone in a Middle-Aged Woman

Department of Medicine, Institute of Adaptation Medicine, School of Medicine, Shinshu University, Matsumoto, Japan

In a middle-aged woman with virilizing adenoma, 2 mg dexamethasone increased urinary excretion of 17-ketosteroids (17-KS) and 17-hydroxycorticosteroids, whereas 8 mg dexamethasone increased urinary excretion only of 17-KS. With discontinuation of dexamethasone, 17-KS excretion returned to the predexamethasone level.

Dexamethasone depressed the basal level of cAMP synthesis and basal testosterone production by the normal adrenal tissue in vitro. Dexamethasone also depressed the increase of cAMP produced by ACTH in the normal tissue. In contrast, dexamethasone increased basal cAMP synthesis and stimulated testosterone secretion in the tumor tissue. ACTH and dexamethasone were additive in their effects on cAMP and testosterone in the tumor tissue. It is suggested that dexamethasone acted directly on the adrenal tumor to stimulate steroid secretion in this patient. (J Clin Endocrinol Metab 48: 660, 1979)

^* To whom requests for reprints should be addressed.

Received August 7, 1978.

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