Adenopathy and extensive skin patch overlying a plasmacytoma is a very rare syndrome featuring a red-to-brown, violaceous skin patch along with a plasmacytoma. Only 11 case reports exist in the literature. Skin biopsies from the cutaneous patch overlying the plasmacytoma exhibit a dermal vascular hyperplasia with increased surrounding dermal mucin. Radiation therapy is used to treat and cure the plasmacytoma.
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