Update on the WHO Classification of Salivary Gland Pathology and the Milan System for Reporting Salivary Gland Cytopathology

Salivary gland tumors are often considered difficult to diagnose pathologically because of their histological variability and complexity. There were only nine types in the first edition (1972) WHO classification salivary tumors; however, 35 will be adopted 5th (2022). This is mainly due epidemiological data, recognition new concepts, advances immunohistochemistry discovery tumor-specific gene mutations.