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- W2079386743 abstract "A middle-aged man presented with weight loss, hypokalemic alkalosis, diabetes, hypertension, and generalized melanosis. Marked elevation of urinary free cortisol (655 micrograms/24 h) and plasma ACTH (2445 PG/ML) SUGGESTED THE DIAGNOSIS OF ECTOPIC ACTH syndrome. The plasma concentrations of cortisol and urinary 17-hydroxycorticosteroids increased paradoxically during the administration of dexamethasone without a corresponding change in the plasma ACTH level. Metyrapone administered over 24 h also markedly incrased both urinary free cortisol and 17-hydroxycorticosteroids. Selective venous sampling of plasma ACTH did not reveal a gradient between jugular vein and peripheral venous blood. The laboratory findings supported the diagnosis of ectopic ACTH syndrome. However, belated occurrence of visual changes necessitated surgical exploration, resulting in the diagnosis of pituitary carcinoma. A fluorescent antibody to ACTH reacted strongly with the atypical pituitary cells. This rare case documents that severe melanosis in Cushing's disease can occur without prior adrenalectomy and is consistent with the diagnosis of pituitary carcinoma. Furthermore, melanosis observed in patients with pituitary carcinoma is associated with ACTH levels similar to those occurrring in the ectopic ACTH or Nelson's syndrome." @default.
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- W2079386743 date "1980-06-01" @default.
- W2079386743 modified "2023-09-27" @default.
- W2079386743 title "Pituitary Carcinoma Mimics the Ectopic Adrenocorticotropin Syndrome" @default.
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- W2079386743 doi "https://doi.org/10.1210/jcem-50-6-1062" @default.
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