Reviews in Endocrine and Metabolic Disorders

, Volume 11, Issue 2, pp 117–126

The ectopic ACTH syndrome

  • Krystallenia I. Alexandraki
  • Ashley B. Grossman
Article
  • 1.5k Downloads

Abstract

Ectopic Cushing’s syndrome usually relates to the ectopic ACTH syndrome (EAS) and represents ∼20% of ACTH-dependent and ∼10% of all types of Cushing’s syndrome (CS). Nearly any neuroendocrine or non-endocrine tumours may be associated with EAS, but the more prevalent tumours are bronchial carcinoids, small cell lung carcinomas, pancreatic carcinoids, thymic carcinoids, medullary carcinomas of the thyroid, and phaeochromocytomas. Occult tumours are highly represented in all the series (12–38%) and constitute the more challenging cases of EAS, requiring long term follow-up. The lack of any completely reliable diagnostic test procedure and imaging to clearly reveal the source of EAS suggests that we should adopt a step-by-step multidisciplinary approach for their diagnosis and therapeutic management. Clinical features are often similar in ACTH-dependent CS, but the rapid onset and progress may suggest an ectopic source. A combination of biochemical tests and imaging studies seems the most appropriate approach for the prompt identification of EAS, even if there are several pitfalls to be avoided along the way. The most appropriate management for cure of EAS, when its source is identified, is surgical excision after controlling the hypercortisolaemia by inhibitors of cortisol secretion and other newer modalities alone or in combination; bilateral adrenalectomy remains an alternative option. Tumour histology, the presence of metastases and the effective control of hypercortisolaemia affect mortality and morbidity. If a source repeatedly fails to be found, the prognosis is often favourable but the identification of a malignant tumour should still be sought during life-long follow-up to avoid the calamity of misdiagnosis.

Keywords

Ectopic Cushing’s syndrome ACTH ectopic syndrome Cushing’s syndrome Neuroendocrine tumours Carcinoids Small cell lung carcinoma Hypercortisolaemia 

Abbreviations

BIPSS

Bilateral inferior petrosal sinus sampling

CRH

Corticotropin-releasing hormone

EAS

ACTH ectopic syndrome

FDG-PET

[18F]Flurodeoxyglucose positron emission tomography

HDDST

High-dose dexamethasone test

LDDST

Low-dose dexamethasone test

MTC

Medullary carcinoma of the thyroid

NETs

Neuroendocrine tumours

NSE

Neuron-specific enolase

Octreoscan

111In-octreotide scintigraphy

POMC

Pro-opiomelanocortin

SCLC

Small cell lung carcinoma

SSAs

Somatostatin analogues

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Copyright information

© Springer Science+Business Media, LLC 2010

Authors and Affiliations

  • Krystallenia I. Alexandraki
    • 1
  • Ashley B. Grossman
    • 1
  1. 1.Department of EndocrinologySt. Bartholomew’s HospitalLondonUK

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