Part of the monoclonal gammopathy of clinical significance spectrum. (A) Bone marrow plasma cells (original magnification, 100×). (B) Osteosclerotic lesions of POEMS syndrome (polyradiculoneuropathy, organomegaly, endocrinopathy, monoclonal plasma cell disorder, and skin changes). (C) Schnitzler syndrome. (D and E) Scleromyxedema. (F) Necrobiotic xanthogranuloma. (G) Cryoglobulinemia vasculitis.