Studies have proven that more than 99% of all cases relating to Nelson Syndrome arise after a patient has had a bilateral adrenalectomy done for Cushing Disease (Chrousos, 25 Jul 2003). The single most common cause of the developing tumor with high levels of adrenocorticotropin or ACTH is primary adrenal insufficiency and this can either be congenital or acquired (Chrousos, 25 Jul 2003). The congenital cause includes hypoplasia or adrenal hyperplasia (Chrousos, 25 Jul 2003). The acquired c

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