Diffuse large B-cell lymphoma of the lacrimal sac arising from a patient with IgG4-related disease.

A rare case of diffuse large B-cell lymphoma (DLBCL) possibly induced by IgG4-related disease is described. A 78-year-old woman was presented with a mass of the right lacrimal sac that extended to the inferior nasal meatus through the nasolacrimal duct. Pathological diagnosis was DLBCL with diffuse distribution of IgG4+cells in the background of this lesion. The chronic inflammatory state of IgG4-related disease could have caused the development of DLBCL.