Lymphadenopathy of IgG4-related sclerosing disease: three case reports and review of literature.

Immunoglobulin (Ig) G4-related sclerosing disease is a recently described syndrome characterized by lymphoplasmacytic infiltration of exocrine glands or extranodal tissues and elevated serum IgG4. We report three cases of lymphadenopathy secondary to IgG4-related sclerosing disease. Histologic features of involved lymph nodes included interfollicular immunoblasts and plasma cells, similar to Castleman's disease.