Localization

Tumours may arise in any part of the oral cavity. The most common sites vary geographically reflecting different risk factors. Lip SCC arise almost exclusively on the lower lip. Within the oral cavity, the subsites at which tumours may be located include: buccal mucosa, upper and lower gingiva, hard palate, anterior two-thirds of the tongue, including dorsal, ventral and lateral surfaces, and the floor of mouth. Many tumours are large at presentation and the tumour site is then recorded as essentially the centre of the tumour. Analysis of small symptomless tumours shows the highest frequency in floor of mouth, ventrolateral tongue and soft palate complex {1655}. This suggests that tumours arise at these sites, but spread preferentially to involve other sites such as tongue, being then recorded as lingual lesions. The clinical relevance of this observation is to emphasise the

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