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In page Congenital adrenal hyperplasia due to 17α-hydroxylase deficiency:

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Normal cortisol level can be explained by the strong negative feedback mechanism of cortisol on hypothalamus-pituitary axis system. That is, in the beginning, 17,20-lyase deficiency will block synthesis of sex steroid hormones, forcing the pathways to produce more cortisol. However, the initial excess of cortisol is rapidly corrected by negative feedback mechanism—high cortisol decreases secretion of adrenocorticotropic hormone (ACTH) from zona fasciculata of adrenal gland. Thus, there is no mineralocorticoid overproduction. Also, there is no adrenal hyperplasia.[citation needed]