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Macular amyloidosis: etiological factors
V Eswaramoorthy1, I Kaur, A Das
1Department of Dermatology, Venereology & Leprology, Postgraduate Institute of Medical Education and Research, Chandigarh, India.
Abstract:
Macular amyloidosis is the commonest form of primary localized cutaneous amyloidosis; its etiology remains unclear. Various incriminating factors include genetics, sunlight, and friction. Seventy-five patients with a clinical diagnosis of macular amyloidosis (confirmed by at least two observers) were enrolled in the study. A detailed history was elicited in relation to the etiological factors and followed by cutaneous examination. Skin biopsy was performed in 44 patients. Amyloid deposits were demonstrated in 21 (48%) of the biopsies. The female to male ratio was over 3:1. Patients with skin type V had a more delayed onset than those with skin types III and IV. Two patients gave histories of regularly subjecting their skin to friction. There was no correlation between the sites affected and the sites subjected to friction, hair style of the patient, or the use of cosmetics. Family history was present in 7 (9.3%) patients. A majority, 44 (58.7%) of the patients, had involvement of both sun-exposed and sun-protected sites. To conclude, there was no direct correlation between macular amyloidosis and atopy, sunlight, or friction to the skin in our patients. Multiple factors may play a collective role in the genesis of macular amyloidosis to variable degrees. These include racial, familial, and environmental factors, atopy, sunlight, friction, and female gender.
Insights
Macular amyloidosis etiology is unclear, with no direct link found to atopy, sunlight, or friction. Multiple factors like genetics, environment, and female gender likely contribute to this skin condition.
Area of Science:
- Dermatology
- Pathology
Background:
- Macular amyloidosis is the most common primary localized cutaneous amyloidosis.
- Its exact cause remains largely unknown, though potential factors are debated.
Purpose of the Study:
- To investigate the etiology of macular amyloidosis.
- To explore correlations between clinical presentation and potential causative factors.
Main Methods:
- A study enrolled 75 patients with diagnosed macular amyloidosis.
- Detailed history, cutaneous examination, and skin biopsies (in 44 patients) were performed.
- Amyloid deposits were confirmed in 48% of biopsies.
Main Results:
- The female to male ratio exceeded 3:1.
- Skin type V showed a delayed onset compared to types III and IV.
- No direct correlation was found with atopy, sunlight exposure, or skin friction.
- Family history was noted in 9.3% of patients.
Conclusions:
- No direct link between macular amyloidosis and atopy, sunlight, or friction was identified in this cohort.
- Multiple factors, including racial, familial, environmental, and gender, may collectively influence the condition's development.
- Further research is needed to elucidate the complex etiology.