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* Floor of the mouth

Fig. 4.32 A Mucoepidermoid carcinoma. Low power showing low-grade tumour with both cystic and solid areas and an inflamed, fibrous stroma. B Adenoid cystic carcinoma. This predominantly solid variant shows peri- and intraneural invasion. C Salivary duct carcinoma with large, somewhat oncocytic cells, cribriform areas, small papillae and comedo-type necrosis.

Fig. 4.32 A Mucoepidermoid carcinoma. Low power showing low-grade tumour with both cystic and solid areas and an inflamed, fibrous stroma. B Adenoid cystic carcinoma. This predominantly solid variant shows peri- and intraneural invasion. C Salivary duct carcinoma with large, somewhat oncocytic cells, cribriform areas, small papillae and comedo-type necrosis.

the tongue, tonsil and oropharynx, cheek, lips, retromolar pad and gingiva {899}. They are much more frequent in the upper lip than the lower lip {669,1871,2711}. Intraoral adenoid cystic carcinomas usually present as slow growing submucosal masses and ulceration may be seen, particularly in the palate. Pain, or evidence of nerve involvement, is usually only present in advanced tumours. Most tumours show the typical cylindromatous or cribriform variant microscopically, but some may have tubular areas and a few are predominantly solid {2711}.

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