Pseudo Cushing's syndrome differential diagnosis

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]}; Associate Editor(s)-in-Chief: Furqan M M. M.B.B.S[2]

Overview

Pseudo-Cushing's syndrome must be differentiated from other diseases that cause hypertension, obesity, and hyperandrogenism, such as Metabolic syndrome X and Cushing's syndrome. Depression may also cause similar symptoms.

Differentiating Pseudo Cushing's Syndrome from other Diseases

  • Differentiation from Cushing's is extremely difficult
  • Causes of Cushing's should be excluded with imaging of the lungs, adrenal glands, and pituitary gland - but these often appear normal in Cushing's anyway
  • In the alcoholic patient with pseudo-Cushing's, admission to hospital (and avoidance of alcohol) will result in normal midnight cortisol levels within 5 days, excluding Cushing's[1]
Diseases with similar symptoms

The table below summarizes the findings that differentiate pseudo-Cushing's disease from other conditions that may cause hypertension, hyperandrogenism, and obesity. Facial plethora, skin changes, osteoporosis, nephrolithiasis and neuropsychiatric conditions.[2][3][4][5]

Conditions Causes Associated features Diagnostic approach
Pseudo-Cushing's syndrome
  • Obesity
  • Alcoholism
  • Depression
  • HIV
  • Urinary free cortisol
  • Midnight salivary cortisol
  • Low dose dexamethasone challenge test
  • Glucose tolerance test
  • Loperamide test
Cushing's syndrome
  • Iatrogenic
  • Pituitary adenoma
  • Adrenal tumor
  • Adrenal hyperplasia
  • Ectopic ACTH secretion
  • 24-hour urine cortisol
  • Midnight salivary cortisol
  • Low dose dexamethasone challenge test
  • CRH stimulation
  • High dose dexamethasone test
  • MRI brain
  • CT/MRI adrenals
Metabolic syndrome X
  • Familial/genetic
  • Obesity
  • Insulin resistance

References

  1. Newell-Price J, Trainer P, Besser M, Grossman A. (1998). "The diagnosis and differential diagnosis of Cushing's syndrome and pseudo-Cushing's states". Endocr Rev. 19 (5): 647–72. PMID 9793762.
  2. Boscaro M, Barzon L, Fallo F, Sonino N (2001). "Cushing's syndrome". Lancet. 357 (9258): 783–91. doi:10.1016/S0140-6736(00)04172-6. PMID 11253984.
  3. Findling JW, Raff H (2001). "Diagnosis and differential diagnosis of Cushing's syndrome". Endocrinol. Metab. Clin. North Am. 30 (3): 729–47. PMID 11571938.
  4. Newell-Price J, Trainer P, Besser M, Grossman A (1998). "The diagnosis and differential diagnosis of Cushing's syndrome and pseudo-Cushing's states". Endocr. Rev. 19 (5): 647–72. doi:10.1210/edrv.19.5.0346. PMID 9793762.
  5. "How Is Metabolic Syndrome Diagnosed? - NHLBI, NIH".

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