Basal cell adenocarcinoma represents only about 1% of all malignant salivary gland epithelial tumors. Most basal cell adenocarcinomas occur in the parotid gland. This report describes a rare case of this tumor arising in the minor salivary glands of the buccal mucosa in a 76-year-old woman. The tumor was resected and immunohistochemical analysis was performed.
Reactivity for anti-smooth muscle actin was confirmed in luminal cells, anti-cytokeratin 14, and anti-S-100 protein in the cytoplasm of tumor cells as wellas in anti-vimentin in stromal elements of tumor cells and anti-ki-67 in peripheral tumor cells. We also performed image cytometric analysis of nuclear DNA content. The mean DNA index was 1.22, ranging from 0.89 to 2.67 and showing a diploid pattern, which suggested that this tumor had lowgrade malignancy.
