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Objective: To analyze the accuracy of frozen section (FS) examination of a borderline ovarian tumor (BOT) and the factors affecting it.Methods : We retrospectively evaluated 132 patients who were operated on in our clinic for ovarian mass between 1996 and 2016, who underwent FS examination and who had a BOT as a result of the final pathology. We investigated the Frozen accuracy, overdiagnosis and underdiagnosis rates and the factors affecting the accuracy of the diagnosis.Results : The mean age of the sample group was 44.6 ± 15.2 years. 50.8% of our patients were serous, 34.8% were mucinous and 14.4% were sero-mucinous in histology. Our Frozen Section accuracy rate was 75%, and underdiagnosis and overdiagnosis rates were 20.5% and 4.5%, respectively.The factors affecting the accuracy of the frozen section were histological type (p = 0.003), presence of solid component (p = 0.002) and preoperative CA 125 value (p = 0.001).Conclusion : Frozen examination has a low accuracy rate that affects the correct selection of surgical treatment for BOTs. FS should be performed by experienced gyneco-pathologists and it is necessary to consider carefully the factors that may cause misdiagnosis of the pathology.

Accuracy of intraoperative frozen section analysis in borderline ovarian tumor and the factors affecting it