Abstract
The early application of needle aspiration to diagnose salivary gland lesions was documented by the 1930s. Over the past few decades, fine-needle aspiration (FNA) has developed into a widely accepted diagnostic procedure and is often the first step in the evaluation of salivary gland mass or cystic lesions. Despite the clinical utility, salivary gland FNA diagnosis remains one of the most challenging fields in cytopathology. The 2017 World Health Organization classification included at least 37 histological types of primary salivary gland tumors; many of them show remarkable overlap of cytomorphological features. In addition, metastatic tumor, reactive process, and inflammation could also form mass or cystic lesions in salivary glands. For a long time, there has been no consensus on how to report salivary gland cytopathology. The result has been inconsistent use of terminologies among institutions and individual cytopathologists. An international group of cytopathologists, surgical pathologists, and head and neck surgeons have recently outlined “Milan System for Reporting Salivary Gland Cytopathology” and corresponding atlas has been published in 2018. The main purpose of this chapter is to highlight the key points in the Milan System for Reporting Salivary Gland Cytopathology and practically important points in salivary gland FNA differential diagnoses. It cannot be overemphasized that these cytomorphological features of FNA must be interpreted in the appropriate clinical and radiological settings, including lesion site and size, speed of growth, clinical symptoms, and the patient’s age, gender, and ethnicity. Like any cytological samples, accurate salivary gland FNA diagnosis depends on adequate tissue sampling. Procedures including rapid on-site evaluation (ROSE) are critical to ensure sufficient diagnostic material.
Due to the significant overlapping among cytomorphological features of different salivary lesions, ancillary tests including immunocytochemistry and molecular tests are important in diagnosis and differential diagnoses in challenging cases. Impressive advances have been made in recent years in the understanding of the molecular pathogenesis of salivary gland tumors. These molecular changes, including several recurrent chromosome translocations, have been identified in several common subtypes of salivary gland tumors. Though validation of these newly identified genetic changes is still in progress, ancillary tests based on these genetic changes have been introduced into cytopathological practice. Immunocytochemistry, including results derived from tissue microarray studies, provides another set of diagnostic markers for more accurate classification of salivary gland tumors.
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Jiang, H., Arbzadeh, E., Gong, Y., Wang, H. (2020). Salivary Gland. In: Xu, H., Qian, X., Wang, H. (eds) Practical Cytopathology . Practical Anatomic Pathology. Springer, Cham. https://doi.org/10.1007/978-3-030-24059-2_14
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