PMC5872656_01
Intraoral view of lesion in anterior maxillary region.
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On examination, a firm ovoid swelling of size 3 x 2.5 cm was found on the attached gingiva with respect to 11 and 12 extending from free marginal groove inferiorly to the buccal sulcus superiorly (Figure 1).
Intraoral periapical radiograph showing mild alteration in the trabecular pattern in relation to 11 and 12.
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Photomicrograph showing lobulated mass of cartilaginous tissue (H&E, 10x).
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The diagnostic clue of the lesion is "histological examination showed well-circumscribed lobulated mass (Figure 3) of cartilaginous tissue with no cellular atypia, necrosis, or vascular invasion.
Photomicrograph showing no cellular atypia (H&E, 40x).
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There was no binucleation or multinucleation (Figure 4)".
Immunostaining showing positivity for vimentin (H&E, 10x).
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Immunohistochemically, most of the tumor cells were positive for vimentin and S100 protein (Figures 5 and 6).
Immunostaining showing positivity for S100 (H&E, 10x).
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Immunohistochemically, most of the tumor cells were positive for vimentin and S100 protein (Figures 5 and 6).
Toluidine blue staining showing typical metachromasia of cartilage.
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For academic interest, toluidine blue staining was done, which showed typical metachromatism (Figure 7).