Basaloid squamous cell carcinoma （BSCC） is a rare variation of squamous cell carcinoma which was first described by Wain in 1986. According to the WHO classification, BSCC shows high malignancy and poor prognosis. Alcohol consumption and smoking are thought to be associated with the onset of this tumor. We report a case of BSCC at the floor of the mouth in a 62-year-old man. Physical examination demonstrated a 25×20mm mass at the left floor of the mouth. Histological examination revealed that the tumor consisted of solid nests of basaloid cells, comedo-like necrosis within tumor islands, cellular pleomorphism and nuclear mitotic activity, and epithelial dysplasia adjacent to the tumor. A pathological diagnosis of BSCC was made. The patient underwent wide resection of the oral floor tumor with marginal left mandibulectomy and functional neck dissection of the left side. Two years later, the patient remains in good health and free of disease.

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Intraductal papilloma is a luminal papillary proliferation of duct epithelium that arises from a segment of the interlobular or excretory duct and causes unicystic dilatation, and is very rare. A review of the Japanese literature reveals no reports of intraductal papilloma arising in the sublingual gland.
We report a case of intraductal papilloma arising in the sublingual gland that was diagnosed as submandibular sialoadenitis.
A 38-year-old woman visited our hospital with the chief complaint of right submandibular swelling. We detected a mass in the right sublingual gland that caused obstruction of the submandibular duct. MR imaging suggested that the round mass had a clear and smooth margin in the sublingual gland.
The tumor was enucleated under local anesthesia. The excised specimen was histologically diagnosed as intraductal papilloma of the sublingual gland.

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Adenoid cystic carcinoma （ACC） is one of the most common malignant salivary gland tumors, and is the major type of malignant tumor in the minor salivary glands. Among salivary gland tumors, the most frequent site of ACC is the palate, followed by the tongue, buccal mucosa, lip, and floor of the mouth. Among the malignant tumors originating from the minor salivary glands of the tongue, more than 85％ involve the base of the tongue. Further, ACC arising from the anterior third of the tongue, particularly from an anterior lingual salivary gland, is extremely rare. Herein, we report a case of ACC originating from the anterior lingual salivary gland. A 72-year-old man presented with an elastic, immobile mass accompanied by pain on the left side of the tongue. Following incisional biopsy, the mass was diagnosed as ACC. Partial glossectomy was performed with sufficient safety margin. The anterior third of the tongue was resected along with the sublingual salivary gland, tissues of the oral floor and the genioglossus muscle. Histological examination revealed typical ACC with the predominant cribriform pattern. Although no tumor cells were detected in the margins, some tumor cells showed perineural invasion. At the 20-month follow-up, no evidence of local recurrence, distant metastasis, or dysfunction was observed. However, ACC has a relentless clinical course and frequently a fatal outcome, owing to its invasive local growth and a high incidence of distant metastasis. Therefore, rigorous long-term follow-up is essential.

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