Lun Zhang

IgG4-related lung disease and seropositive undifferentiated arthritis in a patient initially presenting with monoarthritis: a case report

Abstract Background IgG4-related lung disease (IgG4-RLD) is a fibroinflammatory pulmonary manifestation of IgG4-related disease (IgG4-RD). Its comorbidity with seropositive undifferentiated arthritis (SUA) is rare and may be overlooked due to overlapping clinical and immunologica...