Abstract
We report a case of ACTH-producing thymic carcinoid. A 52-year-old man was admitted because of polyposia and fatigue. Endocrinological examination revealed high plasma ACTH and serum cortisol level, and secretion of cortisol was not inhibited in an 8-mg dexamethazone suppression test. On CT scan, an anterior mediastinal tumor was detected. We diagnosed ectopic ACTH-producing tumor, and performed resection of the thymus. Histologically, the tumor consisted of atypical thymic carcinoid with ACTH production. After resection, the ACTH and cortisol levels normalized and the clinical symptoms disappeared. The patient received adjuvant radiotherapy, and was well without recurrence after surgery.
