#3-09E. Navigating the Overlap: ANCA-Associated Vasculitis in Systemic Sclerosis (Arthritis Rheumatol, Accepted Article)

How should a clinician approach a patient with Systemic Sclerosis (SSc) who presents with acute renal failure? Distinguishing between Scleroderma Renal Crisis (SRC) and ANCA-associated vasculitis (AAV) is critical, yet challenging. A recent multicenter study by Eshagh et al. characterizes this rare overlap in 30 patients, revealing a distinct phenotype where patients predominantly present with limited cutaneous SSc yet frequently carry anti-Scl70 antibodies and suffer from fibrosing interstitial lung disease. The vasculitis typically manifests as MPO-ANCA positive microscopic polyangiitis with renal involvement. Crucially, the study alleviates a major therapeutic concern: treating these patients with high-dose glucocorticoids—the standard of care for vasculitis—did not trigger SRC, despite established fears regarding steroid use in SSc. While these findings advocate for aggressive management of the vasculitis, the retrospective design and small sample size necessitate cautious interpretation regarding generalizability and safety. For the practicing physician, this underscores the importance of testing for ANCA in SSc patients with proteinuria or atypical renal decline, ensuring that potentially life-saving immunosuppression is not withheld due to misdiagnosis or fear of renal crisis.

Citation: Eshagh, D. et al. ANCA-Associated Vasculitides in Systemic Sclerosis: A Unique Clinical Overlap with Significant Implications for Treatment and Outcomes. Arthritis & Rheumatology. Accepted Article. DOI: 10.1002/art.70032

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