CASE REPORTS
JOURNAL ARTICLE
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A case of nodular cutaneous amyloidosis. Amyloid production by infiltrating plasma cells.

We report a solitary nodular form of primary cutaneous amyloidosis due to locally infiltrating plasma cells. An 81-year-old Japanese women presented with a scarlet, dome-shaped 1.5-cm nodule with an irregular surface. Histology showed thick deposits of eosinophilic, oval, and homogeneous bodies in the dermis with mild infiltrates of mononuclear cells. The homogeneous bodies stained positively with periodic acid-Schiff, Congo red, and Yanagihara's Dylon stain, and immunohistochemically with anti-human lambda light-chain antibody. Methylgreen pyronine staining revealed that approximately half of the cellular infiltrates around the vessels were plasma cells. Electron microscopy demonstrated the homogeneous bodies to be amyloid masses, a part of which were in the cytoplasm of the plasma cells. Laboratory examination showed a slight elevation of IgG but no obvious findings suspicious for systemic amyloidosis or gammopathy.

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