THYROID-ASSOCIATED P-ANCA POSITIVE VASCULITIS
By Gary M. White, MD
A pANCA positive vasculitis may occur months to years after starting a thyroid medication. Propylthiouracil is the classic one. The incidence of ANCA-positive propylthiouracil-associated vasculitis is reportedly 39.2 times higher than in patients receiving methimazole. Hydralazine, minocycline, and propylthiouracil are commonly prescribed medications known to cause positive ANA, P-ANCA, and MPO-ANCA test results, and vasculitic skin, kidney, and lung disease
Discontinuing the offending drug is in order. The vasculitis may then spontanously resolve [Acta Dermatovenerol Croat. 2010;18(2):104-6]. Otherwise, systemic steroids may be in given.
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