Since the size of the involved vessels in small-vessel vasculitis (200–500 μm) is smaller than the resolution capability of digital subtraction arteriography (DSA), false-negative results are ...

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Urticarial vasculitis is a rare form of vasculitis that manifests as recurrent wheal-like lesions lasting 24 hours or longer. 1,2 Close examination of the lesions reveals inflamed blood vessels as the ...