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[Benzylthiouracil induced ANCA-positive vasculitis]
Amel Braham1, Med Habib Houman, Lamia Rais
1Service de médecine interne, Hôpital La Rabta, Tunis, Tunisie.
Presse Medicale (Paris, France : 1983)
|December 24, 2004
Summary
Antineutrophil cytoplasmic antibody (ANCA) vasculitis is a rare complication of anti-thyroid drugs like benzylthiouracil. Prompt ANCA testing is crucial for patients with systemic symptoms during treatment.
Area of Science:
- Nephrology
- Rheumatology
- Endocrinology
Background:
- Synthetic anti-thyroid drugs can rarely cause antineutrophil cytoplasmic antibody (ANCA)-associated vasculitis.
- Benzylthiouracil is an uncommon but implicated agent in ANCA vasculitis.
- Few cases link benzylthiouracil to ANCA vasculitis.
Observation:
- A 36-year-old woman developed rapidly progressive kidney failure 3 years post-benzylthiouracil treatment.
- Diagnosis revealed pauci-immune extra-capillary glomerulonephritis and necrotic vasculitis.
- She tested positive for perinuclear ANCA (p-ANCA) with anti-myeloperoxidase (MPO) antibodies.
Findings:
- Treatment with corticosteroids and cyclophosphamide, followed by azathioprine, improved renal function and proteinuria.
- Despite treatment, high p-ANCA levels persisted.
- This case highlights a severe ANCA vasculitis presentation linked to benzylthiouracil.
Implications:
- ANCA vasculitis is a rare but serious adverse effect of thiouracil-type anti-thyroid medications.
- Measuring ANCA is essential in patients on these drugs presenting with systemic symptoms.
- Early detection and management can mitigate severe outcomes.