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Patients with adrenocortical carcinoma (ACC) present with evidence of excessive adrenal steroid hormone in approximately 60% of cases, in which rapidly progressing Cushing's syndrome with or without virilization is the most frequent presentation. Some patients experience an increase or a decline in cortisol production through the progression of their ACC. We report on an unusual case of a cortisol-producing ACC, and the patient presented with a decline in cortisol production, followed by an increase in cortisol production, through the progression of the tumor. A 65-year-old woman who manifested with facial edema and weight gain was diagnosed with Cushing's syndrome, caused by cortisol producing ACC. The patient was treated with adrenalectomy. However, 8 months later, a metastatic hepatic tumor of recurred ACC was detected. At that time, the hormonal evaluation revealed that the liver mass did not produce any hormones. The patient was treated with metastatectomy. Four months later, a relapsed tumor was detected. Increased cortisol production was observed at that time. We speculate there was a change in the clonal dominance within the ACC and this change might cause such a difference. This is the first case report of ACC that showed variable hormone production during progression.