Tumour of a mucosa of an oral cavity - this group includes the malignant tumours arising in tongue, a mucosa of a cheek, a bottom of an oral cavity, alveolar edges of the bottom and top jaw, in firm and a soft palate, forward handles of a palate. The most frequent histological variant of a malignant tumour is the planocellular keratosic tumour. Tumours of this zone meet at men is more often.

Signs. The first clinical displays - painless nodules, superficial erosions and the cracks gradually enlarged. Then there are a pain passing in an ear, a sialosis, the bleedings, a unpleasant smell from a mouth. The tumour of a mucosa of a back half of oral cavity proceeds infects the next organs and tissues more dangerously, more quickly. Tumours can have exophytic (ulcers with the tumoral platen on edges or fungoides growths) or the endophytic form (infiltrates which border to define difficultly). A cancer mucous. Environments of an oral cavity widely metastasizes in superficial and deep lymph nodes of a neck. The remote metastasises meet in 1-5 % of cases.