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Hypocomplementemic urticarial vasculitis or systemic lupus erythematosus?
M Trendelenburg1, S Courvoisier, P J Späth
1Laboratory of Immunonephrology and Clinic of Medicine B, University Hospital, Basel, Switzerland. trendelenbur@ubaclu.unibas.ch
Summary
Hypocomplementemic urticarial vasculitis syndrome (HUVS) often overlaps with systemic lupus erythematosus (SLE). Distinguishing HUVS as a separate entity from SLE remains challenging due to shared clinical and histological features.
Area of Science:
- Nephrology
- Immunology
- Rheumatology
Background:
- Hypocomplementemic urticarial vasculitis syndrome (HUVS) is an autoimmune condition.
- Systemic lupus erythematosus (SLE) is a chronic autoimmune disease.
- Understanding the relationship between HUVS and SLE is crucial for diagnosis and management.
Observation:
- Two patients presented with typical signs of HUVS.
- An inverse correlation between anti-C1q autoantibody titer and serum C1q antigen concentration was observed over two years.
- One patient developed nephritis with immune deposits, and the other later met criteria for SLE.
Findings:
- Histological findings, C1q deposits, and tubuloreticular inclusions suggested SLE in the first patient.
- The second patient developed anti-double-stranded DNA antibodies, fulfilling SLE criteria after a two-year lag.
- The study highlights significant overlap between HUVS and SLE.
Implications:
- Current criteria are insufficient to definitively distinguish HUVS as a separate entity from SLE.
- Further research is needed to establish clear diagnostic criteria for HUVS.
- This overlap necessitates careful evaluation of patients presenting with HUVS for concurrent SLE manifestations.