PMC5996643_01
Extraoral clinical examination revealed palpable and tender swelling extending from behind the ear lobe to the angle of the mouth on the left neck region
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F1
The intraoral examination showed, an ulcero-proliferative lesion involving the left postero-lateral part of the tongue extending onto the soft palate involving faucial pillars
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F2
Left submandibular lymph nodes were palpable, hard, tender, and were fixed to the underlying structures [Figure 2].
Magnetic resonance imaging showing the lesion extended into the posterior wall of the pharynx and to the base of the skull
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F3
The photomicrograph shows dysplastic stratified squamous epithelium invading the connective tissue in the form of nests, islands, and lobules
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F4
The stained sections revealed dysplastic stratified epithelium is seen invading the connective tissue in the form of nests, islands, and lobules [Figure 4].
The photomicrograph shows areas where tumor cells are proliferating in the form of chords interconnecting with each other
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F5
A few areas showed epithelial cells proliferating in the form of chords interconnecting with each other [Figure 5].
The photomicrograph shows tumor islands with areas of comedo-necrosis and focal keratinization
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F6
Islands also displayed areas of comedo-necrosis and focal keratinization [Figure 6].