Temporal artery biopsy showing necrotizing arteritis

Temporal artery biopsy of a patient with microscopic polyangiitis, demonstrating that the temporal artery can be involved by vasculitides other than GCA. Note fibrinoid necrosis, which does not occur in GCA.

GCA: giant cell arteritis, also known as Horton disease, cranial arteritis, and temporal arteritis.

Courtesy of William Docken, MD.

Graphic 109378 Version 4.0

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