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White Addison's disease: what is the possible cause?
A Kendereski1, D Micić, M Sumarac
1Institute of Endocrinology, Clinical Centre of Serbia, Military Medicine Academy, Belgrade, Yugoslavia.
Journal of Endocrinological Investigation
|July 13, 1999
Summary
This study reports a rare case of chronic primary adrenal insufficiency without skin hyperpigmentation, delaying diagnosis. The absence of hyperpigmentation was linked to melanosome degradation, despite elevated melanocyte-stimulating hormones.
Area of Science:
- Endocrinology
- Pathophysiology
- Dermatology
Background:
- Chronic primary adrenal insufficiency, or Addison's disease, typically presents with hyperpigmentation due to elevated proopiomelanocortin (POMC) peptides, including adrenocorticotropic hormone (ACTH) and melanocyte-stimulating hormone (MSH).
- The absence of hyperpigmentation in Addison's disease is unusual and can lead to diagnostic delays, potentially resulting in critical illness.
Observation:
- A 64-year-old woman with chronic primary adrenal insufficiency presented without the characteristic skin hyperpigmentation.
- This atypical presentation delayed diagnosis and led to a critical health state.
Findings:
- Skin biopsy revealed a high degree of melanosome degradation within secondary lysosomes, termed "compound melanosomes," which counteracted increased skin pigmentation stimulation.
- Hormonal assays showed elevated melanocyte-stimulating hormones, with a notably high beta-lipotropic hormone (beta-LPH) to ACTH ratio.
Implications:
- This case elucidates a novel pathogenic mechanism for the absence of hyperpigmentation in Addison's disease, specifically in Caucasian individuals.
- Understanding this mechanism is crucial for timely diagnosis and management of adrenal insufficiency, preventing severe health complications.