Sayanan Chowsilpa1,2, Daniel An3, Holly Lose4, Xiao Huang4, Ritu Nayar4, Zahra Maleki1. 1. Division of Cytopathology, Department of Pathology, The Johns Hopkins Hospital, Baltimore, Maryland. 2. Department of Pathology, Faculty of Medicine, Chiang Mai University, Chiang Mai, Thailand. 3. National Institutes of Health, Bethesda, Maryland. 4. Division of Cytopathology, Department of Pathology, Northwestern University, Chicago, Illinois.
Abstract
BACKGROUND: Salivary gland neoplasm of uncertain malignant potential (SUMP) is a diagnostic category in the Milan System for Reporting Salivary Gland Cytopathology. The objective of this study was to assess the risk of neoplasm (RON) and the risk of malignancy (ROM) in SUMP cases by evaluating them based on their prominent cytomorphology. METHODS: The pathology databases were searched for cases of fine-needle aspiration-diagnosed SUMP at The Johns Hopkins Hospital and Northwestern University from 2013 to 2018. Only cytopathology cases diagnosed as SUMP that had available surgical follow-up were included. RESULTS: Sixty-five patients with SUMP were identified, including 31 men and 34 women who ranged in age from 15 to 87 years (mean age, 55.2 years). Sixty-five cases had histologic follow-up, including 13 (20%) with basaloid features, 13 (20%) with oncocytic features, and 39 (60%) with unspecified features. No cases with clear cell features were found. Overall, the RON in the SUMP category was 95.4% (62 of 65 cases), and the ROM was 33.8% (22 of 65 cases). The RON in SUMPs with basaloid, oncocytic, and unspecified subtypes was 92.3%, 100%, and 94.9%, respectively, whereas the ROM was 38.5%, 7.7%, and 41%, respectively. The most common benign neoplasm was pleomorphic adenoma (23.1%), whereas mucoepidermoid carcinoma (9.2%) was the most common malignant neoplasm. CONCLUSIONS: This study shows that the ROM differs significantly based on cytomorphology subtypes, whereas the overall ROM is approximately the same as the target rate in the Milan System for Reporting Salivary Gland Cytopathology. Moreover, the RON remains high in the SUMP category among different cytomorphology subtypes. Adequate sampling, immunohistochemical staining, and familiarity with metaplastic and reactive changes may improve the diagnosis.
BACKGROUND:Salivary gland neoplasm of uncertain malignant potential (SUMP) is a diagnostic category in the Milan System for Reporting Salivary Gland Cytopathology. The objective of this study was to assess the risk of neoplasm (RON) and the risk of malignancy (ROM) in SUMP cases by evaluating them based on their prominent cytomorphology. METHODS: The pathology databases were searched for cases of fine-needle aspiration-diagnosed SUMP at The Johns Hopkins Hospital and Northwestern University from 2013 to 2018. Only cytopathology cases diagnosed as SUMP that had available surgical follow-up were included. RESULTS: Sixty-five patients with SUMP were identified, including 31 men and 34 women who ranged in age from 15 to 87 years (mean age, 55.2 years). Sixty-five cases had histologic follow-up, including 13 (20%) with basaloid features, 13 (20%) with oncocytic features, and 39 (60%) with unspecified features. No cases with clear cell features were found. Overall, the RON in the SUMP category was 95.4% (62 of 65 cases), and the ROM was 33.8% (22 of 65 cases). The RON in SUMPs with basaloid, oncocytic, and unspecified subtypes was 92.3%, 100%, and 94.9%, respectively, whereas the ROM was 38.5%, 7.7%, and 41%, respectively. The most common benign neoplasm was pleomorphic adenoma (23.1%), whereas mucoepidermoid carcinoma (9.2%) was the most common malignant neoplasm. CONCLUSIONS: This study shows that the ROM differs significantly based on cytomorphology subtypes, whereas the overall ROM is approximately the same as the target rate in the Milan System for Reporting Salivary Gland Cytopathology. Moreover, the RON remains high in the SUMP category among different cytomorphology subtypes. Adequate sampling, immunohistochemical staining, and familiarity with metaplastic and reactive changes may improve the diagnosis.
Keywords:
basaloid; cytology; fine-needle aspiration (FNA); oncocytic; risk of malignancy (ROM); risk of neoplasm (RON); salivary gland; salivary gland neoplasm of uncertain malignant potential (SUMP); the Milan System for Reporting Salivary Gland Cytopathology (MSRSGC)
Authors: Austin B Wiles; Matthew Gabrielson; Zubair W Baloch; William C Faquin; Vickie Y Jo; Fabiano Callegari; Ivana Kholova; Sharon Song; Barbara A Centeno; Syed Z Ali; Satu Tommola; Guido Fadda; Gianluigi Petrone; He Wang; Esther D Rossi; Liron Pantanowitz; Zahra Maleki Journal: Cancer Cytopathol Date: 2022-04-06 Impact factor: 4.264