A case is presented of Nelson's Syndrome concomitant with Cushing's Syndrome in a female patient who underwent five years earlier bilateral adrenalectomy due to Cushing's Disease. Together with hyperpigmentation, very elevated ACTH, and intrasellar mass in CT scan, plasma cortisol levels without rythm and not suppressible were observed as well as increased cortisol in urine. The macroadenoma was resected though the sphenoid and later hypophysis radiotherapy was given, with a clinical remission and biochemical improvement of the syndrome. At the present time, slightly elevated ACTH levels persist, with panhypopituitarism and empty sella turcica. The clinical picture is described and a literature search is carried out.