Probable Immunoglobulin Subtype-G4-Related Disease in the Head and Neck from Foreign Body Injection: A Case Report.

Introduction Immunoglobulin subtype G4-related disease (IgG4-RD) is a fibroinflammatory disease of unknown etiology, with manifestations involving nearly every organ system. Its association with foreign bodies is not established. Here, we present a novel case of IgG4-RD in response to foreign body injection.