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. 2019 Jan 29;13(1):103–113. doi: 10.1007/s12105-019-01000-w

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© The Author(s) 2019

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 2 — a A PGCG in an edentulous span of the maxilla. b Numerous multinucleated giant cells in a vascular and monocellular background in PGCG (H&E, Overall magnification × 40). c Lesions of ligneous alveolitis on the edentulous mandibular ridge. d Fibrinous deposits are seen in ligneous gingivitis, closely associated with the surface epithelium. Whilst suggestive of amyloid, these are Congo Red negative (H&E, overall magnification × 100). e Widespread “strawberry gingivitis” appearance of the maxillary gingiva in a patient with GPA. f The classic histological features of GPA can be difficult find in a gingival biopsy. The photomicrograph shows a small vessel with leukocytoclastic vasculitis and a poorly formed granuloma to the left of it (H&E, overall magnification × 100)