Fig. 6

Histological observation of the mandibular hyperplastic gingival tissue. Low magnification observation of hematoxylin eosin staining (a) (scale bar = 500 µm). Under high magnification observation, colonies of histiocytes in lamina propria were identified, together with multinucleated giant cells, and small amounts of lymphocytes, plasma cells, eosinophils, and Touton giant cells; there were few areas of calcifications (b) (scale bar = 50 µm). The arrows indicated Touton giant cells