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Cushing Syndrome II: Pathophysiology

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A Novel Method: Super-selective Adrenal Venous Sampling
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The ectopic ACTH syndrome.

Krystallenia I Alexandraki1, Ashley B Grossman

  • 1Department of Endocrinology, St. Bartholomew's Hospital, London EC1A7BE, UK.

Reviews in Endocrine & Metabolic Disorders
|June 15, 2010
PubMed
Summary
This summary is machine-generated.

Ectopic ACTH syndrome (EAS), a cause of Cushing's syndrome (CS), often originates from occult tumors. Early diagnosis and multidisciplinary management, including biochemical tests and imaging, are crucial for effective treatment and improved outcomes.

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Area of Science:

  • Endocrinology
  • Oncology

Background:

  • Ectopic Cushing's syndrome (ECS) is primarily linked to ectopic ACTH syndrome (EAS), accounting for approximately 20% of ACTH-dependent and 10% of all Cushing's syndrome cases.
  • While various tumors can cause EAS, common culprits include bronchial carcinoids, small cell lung carcinomas, pancreatic carcinoids, and pheochromocytomas.
  • Occult tumors are frequently implicated in EAS (12-38%), presenting significant diagnostic challenges and necessitating long-term patient follow-up.

Purpose of the Study:

  • To outline the diagnostic and therapeutic strategies for ectopic ACTH syndrome (EAS).
  • To emphasize the importance of a multidisciplinary approach in managing EAS, particularly when the tumor source is occult.
  • To highlight key clinical features, diagnostic pitfalls, and management options for EAS.

Main Methods:

  • Review of clinical features, diagnostic tests, and management strategies for EAS.
  • Integration of biochemical tests and imaging studies for prompt identification of EAS.
  • Surgical excision of the tumor source as the primary curative treatment, alongside hypercortisolemia control.

Main Results:

  • Rapid onset and progression of clinical features can suggest an ectopic source of ACTH.
  • A combination of biochemical and imaging studies is essential for EAS diagnosis, though pitfalls exist.
  • Successful surgical excision of the tumor source leads to cure, while management of hypercortisolemia is critical for patient outcomes.

Conclusions:

  • A step-by-step, multidisciplinary approach is recommended for the diagnosis and management of EAS due to diagnostic limitations.
  • Surgical excision of the identified tumor is the preferred treatment, with medical management of hypercortisolemia and bilateral adrenalectomy as alternatives.
  • Long-term follow-up is vital for patients with persistent occult sources to identify potential malignancies and improve prognosis.