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Tumors located outside the pituitary gland that produce the adrenocorticotropic hormone (ACTH) may cause, on rare occasions, cyclic Cushing’s syndrome — when cortisol levels show substantial fluctuations over time. That finding, based on the case of a patient with ACTH-secreting lung cancer, is found in the study, “Cyclic Cushing’s syndrome caused by neuroendocrine tumor: a case report,” which was published in Endocrine Journal. Cushing’s syndrome is characterized by too much cortisol, either due to adrenal tumors that produce cortisol in excess, or because too much ACTH in circulat