Abstract
Background
To determine the cytomorphological features of complex type fibroadenoma (CFA), we reviewed fine needle aspiration (FNA) cytology with correlation to its histopathology findings, and compared them with non-complex type fibroadenoma (NCFA).
Methods
From excisional biopsy or resected specimens of fibroadenoma (FA) cases treated at our institution from 2004 to 2013, we chose 46 patients who underwent FNA before a diagnosis of FA was established. We histologically re-classified them into two groups: CFA and NCFA. FNA diagnosis was retrospectively re-evaluated from FNA reports. We further re-assessed detailed characteristics of each FNA smears to identify cytomorphological features of CFA.
Results
We found that 15 cases fulfilled the diagnostic criteria of CFA, in which 7 (46.7 %) had an FNA diagnosis of “suspicious for malignancy” or “indeterminate” while only 2 NCFA cases had that of “indeterminate” (p = 0.004). FNA smears from CFA cases showed discohesiveness, enlarged nuclei, prominent nucleoli, and fewer myoepithelial cells more often than NCFA. Although no significant difference was noted in patients’ age and tumor size between CFA and NCFA, 5 CFA cases (33.3 %) were accompanied by the presence of carcinoma in the same breast or the contralateral breast while no NCFA cases had carcinoma in the breast.
Conclusions
FNA of CFA can lead to erroneous or indeterminate interpretation, due to proliferative and/or hyperplastic changes of ductal epithelium with or without atypia. It is important to recognize the disease entity and characteristic cytomorphological findings of CFA to reach accurate FNA diagnosis of breast lesions.
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Acknowledgments
The authors thank Ms Ayako Hayama (Division of Diagnostic Pathology, Nippon Medical School Hospital) for preparing tissue blocks and slides.
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This study was conducted in accordance with the principles embodied in the Declaration of Helsinki (2008). Patients’ consent was obtained for the use of clinical samples for research purposes according to the regulations defined by the Ethics Committee of Nippon Medical School Hospital.
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Ohashi, R., Matsubara, M., Watarai, Y. et al. Cytological features of complex type fibroadenoma in comparison with non-complex type fibroadenoma. Breast Cancer 23, 724–731 (2016). https://doi.org/10.1007/s12282-015-0632-9
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DOI: https://doi.org/10.1007/s12282-015-0632-9