Histochemical and electronic microscopical studies of stellate fibrillar formations (SFF) in salivary gland tumors

PURPOSE: To study the structure and significance of SFF in pleomorphic adenoma and myoepithelioma. MATERIAL AND METHODS: Tow cases of each tumor were studied. Histologie and ultrathin sections were made, stained with HE, Mallory, Van Gieson, Pollak methods, and examined with light and transmission electronic microscopes. RESULTE: The SFF were proved to be formed by radial arrangement of collagen fibers, which were composed of striped fibrillae under TEM. CONCLUSION: The structure of the SFF is understood, their existence may play a role the pathologic diagnosis.