Ann Dermatol.  2011 Nov;23(4):515-518.

Primary Localized Cutaneous Nodular Amyloidosis Following Local Trauma

• Lee DY
• Kim YJ
• Lee JY
• Kim MK
• Yoon TY

Abstract

Primary localized cutaneous nodular amyloidosis (nodular amyloidosis) is a rare and distinct type of amyloidosis, in which amyloid L deposition is limited to the skin and typically manifested as a tumefactive nodule on the acral sites. However, the definite cause of nodular amyloidosis is still unknown. Although it is relatively well known that the amyloid deposits in nodular amyloidosis originate from immunoglobulin light chains secreted by local plasma cells, traumatic injury to the skin has rarely been recognized as a triggering factor of nodular amyloidosis. Herein, we present a case of a 50-year-old male patient with primary localized cutaneous nodular amyloidosis, which occurred after local trauma, and discuss the relationship between traumatic damage and dermal amyloid L deposition.

Keyword

Primary localized cutaneous nodular amyloidosis; Trauma

MeSH Terms

Amyloid
Amyloidosis
Humans
Immunoglobulin Light Chains
Male
Middle Aged
Plaque, Amyloid
Plasma Cells
Skin
Amyloid
Immunoglobulin Light Chains

Figure

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  Fig. 1 A 5×5 cm sized, well-demarcated, dome-shaped, salmon-colored, waxy nodule with overlying purpuric plaques on the frontal scalp.

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  Fig. 2 (A) Deposition of acellular amorphous eosinophilic materials over the entire dermis (H&E, ×100). (B) Infiltration of numerous plasma cells within the deposits (H&E, ×400).

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  Fig. 3 Characteristic apple-green birefringence under polarized light (Congo red staining, ×200).

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  Fig. 4 Amyloid filaments are straight, long, and of uniform diameter (TEM, ×20,000).

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