Breast FNA cytology reporting using new proposed IAC Yokohama reporting system: A single institution retrospective study

Abstract

Introduction: Breast lumps are a common presenting complaint in general practice. Breast cancers are the most common cancers diagnosed over the world along with unfortunate rise in number of mortality due to them. Proper diagnostic evaluation is necessary. The fine needle aspiration cytology (FNAC) examination of breast lumps is important as it can be used either to differentiate between benign and malignant breast lesion or as an adjunct to core needle biopsy. In 2016 the IAC Yokohama five category reporting system was proposed to allow uniform reporting of breast FNA aspirates. Aim: The current study aims to reclassify breast lump aspirates using the proposed Yokohama reporting system and also to assess the risk of malignancy of each category. Materials and Methods: This single institution retrospective study included female breast lump FNAC cases over 4 year period. Clinical details of included cases were recorded from archives. Cytology slides were reevaluated as per new reporting system and the histopathology correlation was done where available. Statistical analysis was performed. Risk of malignancy of each category was calculated. Results: 649 breast FNAC cases were studied of average age 36.97 years. Maximum cases were in benign category followed by malignant category. Fibroadenoma was most common benign diagnosis. The risk of malignancy was 3.17% in benign category and 95.45% in suspicious for malignancy category. The diagnostic accuracy in current study was 97.83%. Conclusion: Use of a standard categorical cytology reporting system will give improved reports for better patient care.