Fig. 4. Gingiva region of the left lower molars at 8 months after initial visit. (A) Mass formation and severely gingival swelling and bleeding. (B) Histopathologic examinations of a biopsy specimen with H&E staining (magnification: ×400). Islands of malignant squamous epithelium invading into the connective tissue, dysplastic epithelial cells with keratin pearl formation, and abnormal mitosis were observed.

J Oral Med Pain 2024;49:153-7 https://doi.org/10.14476/jomp.2024.49.4.153

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