小唾液腺由来の単形性管状腺腫の1例とその組織学的検討

A Case of Monomorphic Tubular Adenoma (Canalicular Type) of Minor Salivary Gland

はじめに

　WHOの唾液腺腫瘍分類（表1）において，単形性腺腫の中でも「other type」は比較的稀であり，今まであまり興味を持たれていない。今回私達は口腔前庭に発生した単形性管状腺腫を経験し組織学的検討の機会を得たので，文献的考察を加え報告する。

A 74-year-old man complained of a painless mass around the left upper lip. This mass presented with the charactristic histological pattern com-posed of cords and ducts of uniform epithelium and was diagnosed as canalicular type of mono-morphic adenoma within tubular adenoma, a very rare salivary gland tumor that has infrequently been reported in the literature. This canalicular type of monomorphic adenoma of the minor salivary gland origin has never been reported in Japan.

Histological study revealed that this tumor was originated in the duct of the minor salivary gland and there was no association with pleomorphic adenoma.

Histological differentiation between malignant tumor, for example, adenoid cystic carcinoma and benign tumor is very important, so early extirpa-tion is necessary when it is small and localized tumor.