15. Adenomyoepithelioma
Composed of spindle-shaped myoepithelial components and ductal elements. Spindle cells are reactive for keratin and actin and can in this way be distinguished from sarcomas. These tumors contain mucin which is apparent when cutting fresh specimens. Further differentiation of ductal cells (sebaceous glands and follicular structures) or myoepithelial cells (cartilage, bone, connective tissue) can be observed on transplantation of these tumors. Also referred to as 'Adenocarcinoma type C', 'Fibroadenoma', 'Carcinosarcoma', 'Mixed tumor'