eMedicine Specialties > Dermatology > Metabolic Diseases
Amyloidosis, Macular: Differential Diagnoses & Workup
Updated: Sep 25, 2009
- Overview
- Differential Diagnoses & Workup
- Treatment & Medication
- Follow-up
- Multimedia
Differential Diagnoses
Atopic Dermatitis
Dermatomyositis
Poikiloderma of Civatte
Postinflammatory Hyperpigmentation
Other Problems to Be Considered
Poikiloderma secondary to mycosis fungoides, dermatomyositis, and scleroderma
Multiple endocrine neoplasia type 2A8
Workup
Procedures
A skin biopsy may be performed.
Histologic Findings
Many stains can demonstrate amyloid deposits in the skin. The best known is the Congo red stain, which under polarizing light gives apple-green birefringence. Other stains include periodic acid-Schiff (PAS); methyl violet; crystal violet; various cotton dyes (eg, pagoda red, Sirius red); and the fluorescent dyes, thioflavin-T and Phorwhite BBU.
In macular amyloidosis, the amyloid deposits are usually found within the dermal papillae. The amyloid deposits are usually globular, resembling colloid bodies, and they may be in contact with basal cells at the dermoepidermal junction. The deposits can be minute, escaping detection. For this reason, macular amyloidosis is part of the differential diagnosis for the "normal skin" slide, sometimes called invisible dermatosis. Minimal epidermal changes, such as hyperkeratosis and hypergranulosis, are occasionally observed.
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References
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Further Reading
Keywords
amyloidosis, macular amyloidosis, amyloid, amyloid-P, serum amyloid-P, SAP, Sipple syndrome, MA
Differential Diagnoses & Workup: Amyloidosis, Macular