Fig. 4
From: Difficult and complicated oral ulceration: an expert consensus guideline for diagnosis
A 25-year-old woman with ulcer for 2 months. Serious erosion and necrosis on the upper labial mucosa, extending to anterior maxillary gingiva covered by yellowish-white pseudomembrane. HE staining and immunohistochemical studies of the biopsy supported the diagnosis of nasal-type extranodal NK/T-cell lymphoma
