Vasculitis in primary Sjögren's syndrome. Histologic classification and clinical presentation

Area of Science:

• Rheumatology
• Immunology
• Pathology

Background:

• Primary Sjögren's syndrome is a chronic autoimmune disease primarily affecting exocrine glands.
• Vasculitis, inflammation of blood vessels, is a known but less common complication of autoimmune disorders.
• Understanding the specific types and clinical manifestations of vasculitis in Sjögren's syndrome is crucial for patient management.

Purpose of the Study:

• To investigate the prevalence and characteristics of vasculitis in patients with primary Sjögren's syndrome.
• To differentiate between small and medium-sized vessel vasculitis and their associated clinical presentations.
• To explore potential pathogenetic mechanisms, such as immune complex involvement, in Sjögren's syndrome-associated vasculitis.

Main Methods:

• Retrospective analysis of clinical and histological data from 70 patients with primary Sjögren's syndrome.
• Classification of vasculitis based on vessel size (small vs. medium) and histological findings.
• Correlation of vasculitis type with clinical symptoms, organ involvement, and laboratory markers (anemia, cryoglobulinemia, hypocomplementemia).

Main Results:

• Nine out of 70 patients (12.8%) exhibited vasculitis affecting small and/or medium-sized vessels.
• Small vessel vasculitis was characterized as hypersensitivity type (leukocytoclastic, lymphocytic), primarily affecting skin with mild symptoms.
• Medium vessel vasculitis resembled polyarteritis nodosa histologically, affecting internal organs with life-threatening consequences; endarteritis obliterans was observed in chronic cases.

Conclusions:

• Vasculitis is a significant complication in a subset of primary Sjögren's syndrome patients, with distinct small and medium vessel patterns.
• Hypersensitivity vasculitis presents with milder, skin-predominant symptoms, while polyarteritis nodosa-like vasculitis is associated with severe, organ-threatening disease.
• Clinical findings like anemia, cryoglobulinemia, and hypocomplementemia suggest an immune-complex mediated pathogenesis for vasculitis in Sjögren's syndrome.