Immunoglobulin G4-related disease (IgG4-RD) is a systemic disease, and lymphadenopathy is frequently observed in these patients. Among the 5 subtypes of IgG4-related lymphadenopathy, progressively transformed germinal centers (PTGC)-type IgG4-related lymphadenopathy possesses a unique characteristic that differentiates it from the other 4 subtypes. Here, we report on a rare case of PTGC-type Ig...
