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Steroid profile in an adrenocortical carcinoma producing aldosterone.

We report a rare case of primary aldosteronism due to an adrenocortical carcinoma. A 61-year-old woman with a history of hypertension and hypokalemia was referred for evaluation of a 4.2 cm measuring adrenal mass without secondary signs of malignancy. Endocrinological testing was consistent with primary aldosteronism. The patient underwent surgical resection of the adrenal mass; histology revealed an adrenocortical carcinoma. Postoperatively blood pressure, serum potassium, and aldosterone returned to normal. Four months after adrenalectomy, the patient presented again with hypokalemic hypertension and was found to have metastatic disease. Endocrinological investigation revealed primary aldosteronism and subclinical autonomous glucocorticoid hypersecretion. Careful hormonal investigation should be obtained in patients with adrenal masses causing excessive aldosterone secretion. In uncertain cases of primary aldosteronism, we would suggest to measure 18-hydroxycortisol levels, as excessive amounts may indicate adrenocortical carcinoma.