Abstract
The term ‘atypical’ shows marked variation among reporting pathologists and in terms of the subsequent management. A definition and recommended management are provided in this chapter. The causes of atypical cytology are discussed including the training and expertise of the reporting pathologist, limitations in the technical quality of the smears and the inherent nature of proliferative lesions of the breast. These include fibroadenomas, intraductal papillomas, epithelial hyperplasia, lobular neoplasia, low-grade ductal carcinoma in situ and low-grade invasive carcinomas. Distinguishing fibroadenomas with hypercellular stroma and low-grade phyllodes tumours is also discussed. The cytological findings of the uncommon adenomyoepithelioma are presented.
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Field, A. S., Ljung, B. M., Rickard, M. T., Tse, G. M., Sauer, T., Lee, A. H. S., … Raymond, W. A. (2020). Atypical. In The International Academy of Cytology Yokohama System for Reporting Breast Fine Needle Aspiration Biopsy Cytopathology (pp. 51–66). Springer International Publishing. https://doi.org/10.1007/978-3-030-26883-1_4
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