John H Stone’s #IgG4RD lessons: 1-It is a variable-vessel vasculitis 2-more common/severe in males (2:1) 3-Has no diagnostic histopathology 4-IgG4 does not cause IgG4RD 5-Serum igg4 is a good biomarker 6-Rising IgG4 shouldn’t be ignored #EULAR2024 https://t.co/7p6pBqI4ue