The 2020 revised comprehensive diagnostic (RCD) criteria for IgG4-RD

Area of Science:

• Rheumatology and Immunology
• Pathology and Diagnostics

Background:

• Immunoglobulin G4-related disease (IgG4-RD) is a multi-organ fibrotic condition with diverse clinical presentations.
• The initial 2011 diagnostic criteria for IgG4-RD faced challenges including biopsy difficulties and limitations in serum IgG4 testing and immunostaining.
• IgG4-RD encompasses conditions previously known as Mikulicz's disease (MD) and autoimmune pancreatitis (AIP).

Purpose of the Study:

• To present the updated 2020 Revised Comprehensive Diagnostic (RCD) criteria for IgG4-RD.
• To address and overcome limitations encountered with the 2011 diagnostic criteria in clinical practice.

Main Methods:

• Development of a revised diagnostic framework incorporating three key domains: clinical/radiological features, serological diagnosis, and pathological diagnosis.
• Inclusion of specific pathological hallmarks: storiform fibrosis and obliterative phlebitis in the updated criteria.

Main Results:

• The 2020 RCD criteria offer a refined approach to diagnosing IgG4-RD.
• The revised criteria integrate clinical, serological, and pathological findings for enhanced diagnostic accuracy.
• Pathological diagnosis now explicitly includes storiform fibrosis and obliterative phlebitis.

Conclusions:

• The 2020 RCD criteria represent a significant advancement in the standardized diagnosis of IgG4-RD.
• These updated criteria aim to improve diagnostic consistency and clinical management of IgG4-RD globally.