Abstract
Objective : We examined retrospective analyses of fine needle aspiration (FNA) samples in the salivary gland region using the Milan System for Reporting Salivary Gland Cytopathology (MSRSGC) to clarify the histological type and cytological characteristics in each category.
Study Design : One hundred twenty one cases, who had undergone surgical resection in Kurume University Hospital in the period from 2013 to 2017, were included in the present study.
Results : The total number of entities and risk of malignancy (ROM) in 121 reviewed cases were as follows : non-diagnostic 9 (7.4%) (ROM 0%), non-neoplastic 4 (3.3%) (ROM 0%), atypia of undetermined significance (AUS) 14 (11.6%) (ROM 35.7%), benign neoplasm 57 (47.1%) (ROM 1.7%), salivary gland neoplasm of uncertain malignant potential (SUMP) 19 (15.7%) (ROM 36.8%), suspicious for malignancy 3 (2.5%) (ROM 100%), malignancy 15 (12.3%) (ROM 100%). ROM of AUS in our series was high compared to that in the proposal figure in MSRSGC. Out of cases finally diagnosed as malignant in AUS, malignant lymphoma was the most frequent histologic type. One of the common cytological findings observed in SUMP was a pattern with basaloid cell predominance.
Conclusion : It is important to clearly understand the histological types and cytological characteristics in each category, especially regarding AUS and SUMP in the MSRSGC.
