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[Ectopic ACTH syndrome (author's transl)].

F Zurbano Goñi

    Medicina Clinica
    |March 25, 1979
    PubMed
    Summary

    Ectopic ACTH syndrome, caused by tumors secreting adrenocorticotropic hormone (ACTH), leads to Cushing's syndrome symptoms. Early diagnosis and surgical tumor removal are crucial for treatment.

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    Area of Science:

    • Endocrinology
    • Oncology
    • Pathology

    Background:

    • Ectopic ACTH syndrome is a rare condition where tumors produce adrenocorticotropic hormone (ACTH).
    • This leads to clinical and chemical abnormalities resembling Cushing's syndrome due to adrenal gland overstimulation.
    • Tumors can arise in various organs, most commonly the lungs, thymus, pancreas, or gastrointestinal tract, and are often malignant.

    Purpose of the Study:

    • To describe the clinicopathologic features of ectopic ACTH syndrome.
    • To highlight the diagnostic challenges and clinical manifestations.
    • To outline the treatment and prognosis of this condition.

    Main Methods:

    • Review of clinicopathologic findings in patients with ectopic ACTH syndrome.
    • Analysis of hormonal assays, including ACTH levels and urinary corticosteroids.
    • Evaluation of tumor characteristics and treatment outcomes.

    Main Results:

    • Ectopic ACTH is biochemically distinct from pituitary ACTH, often being of higher molecular weight.
    • Clinical presentation may differ from classic Cushing's syndrome, with melanodermia and hypokalemic alkalosis being common, while moon face and obesity are less frequent.
    • Laboratory findings include elevated ACTH, disrupted circadian rhythms, increased urinary steroids, and abnormal response to stimulation/suppression tests.

    Conclusions:

    • Ectopic ACTH syndrome requires prompt recognition due to its rapid progression and poor prognosis.
    • Complete surgical resection of the causative tumor offers the best treatment option.
    • Adjuvant therapies like irradiation, chemotherapy, or adrenal suppression may be necessary.

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