Necrotizing vasculitis in a patient affected by autoimmune hyperthyroidism treated with propylthiouracil

Area of Science:

• Immunology
• Endocrinology
• Rheumatology

Background:

• Necrotizing vasculitis involves inflammation of blood vessels, often linked to autoimmune conditions.
• Propylthiouracil (PTU), a hyperthyroidism treatment, is a known rare cause of antineutrophil cytoplasm antibody-associated vasculitis.

Observation:

• A 34-year-old female with autoimmune hyperthyroidism developed necrotizing vasculitis.
• The patient presented with high anticardiolipin antibodies and vasculitis affecting the upper arms and buttocks.

Findings:

• The vasculitis was confirmed as antineutrophil cytoplasm antibody-positive.
• Discontinuation of PTU and initiation of immunosuppressive therapy led to clinical improvement.

Implications:

• This case underscores the critical importance of recognizing PTU as a potential trigger for severe autoimmune vasculitis.
• Prompt diagnosis and management, including drug withdrawal and immunosuppression, are crucial for favorable outcomes in PTU-induced vasculitis.