basal cell adenoma
Basal cell adenoma is an uncommon epithelial neoplasm of the salivary gland most commonly arising in the parotid glands.
Localization
parotid glands (mostly)
minor salivary gland
presenting as a slowly progressing, large parapharyngeal mass. Histopathology revealed a well-encapsulated mass with characteristic histomorphology.
Immunohistochemistry
pancytokeratin+
S-100+
smooth muscle actin+ (myoepithelial cells)
carcinoembryonic antigen+ (ACE+)
vimentin+
Ultrastructure
reduplicated basal laminae around the tumor cells
presence of intermediary filaments
rough endoplasmic reticulum