We report herein the case of a 40-year-old man with Cushing's syndrome, diagnosed by clinical manifestations and endocrinological studies, who was found to have bilateral adrenocortical adenomas, one of which hypersecreted cortisol. The Cushing's syndrome was therefore attributed to primary adrenocortical disease, and the right adrenal tumor was resected and histologically diagnosed as a so-called black adenoma. After resection of the right tumor, the left adrenal tumor showed no signs of cortisol hypersecretion for the 23 months of follow-up until the patient died of peritonitis subsequent to the rupture of a duodenal ulcer. The left adrenal tumor was examined at autopsy and found to be a cortical adenoma. These data imply that the adrenal adenomas developed primarily from the adrenal gland itself, and that one of the tumors was well differentiated and secreted excess hormones, while the other remained in cell proliferation without hypersecretion.
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