Fax: (734) 763-4095
Can true papillary neoplasms of breast and their mimickers be accurately classified by cytology?
Article first published online: 21 MAR 2002
Copyright © 2002 American Cancer Society
Volume 96, Issue 2, pages 92–100, 25 April 2002
How to Cite
Michael, C. W. and Buschmann, B. (2002), Can true papillary neoplasms of breast and their mimickers be accurately classified by cytology?. Cancer, 96: 92–100. doi: 10.1002/cncr.10481
- Issue published online: 8 APR 2002
- Article first published online: 21 MAR 2002
- Manuscript Accepted: 18 JUL 2001
- Manuscript Revised: 17 JUL 2001
- Manuscript Received: 8 SEP 2000
- papillary carcinoma;
- intraductal papilloma;
- breast neoplasms
The cytologic accuracy in assessing malignancy in papillary breast neoplasms (PBNs) is controversial. This is further complicated by overlapping features observed in other breast lesions that produce papillary-like tissue fragments.
The authors reviewed 22 fine-needle aspirates (FNAs) from histologically proven papillary neoplasms: papillary carcinoma (PCA; 10 aspirates) and intraductal papilloma (IDP; 12 aspirates). They also reviewed 8 FNAs in which a papillary neoplasm was suggested by cytology but not confirmed by follow-up biopsy: fibroadenoma (6), mucinous carcinoma (1), and cribriform ductal carcinoma in situ (1).
Papillary carcinoma can be distinguished from IDP by the higher cellularity, more complex papillae with thin disorganized fronds, mild to moderate nuclear atypia, and prominent dissociation with many single papillae. Fibrovascular cores (FVCs) were more common in PCA than IDP in which detached fibrous tissue fragments were frequently seen. Atypical IDP exhibited features intermediate between PCA and IDP. Apocrine metaplasia was variably present in IDP, atypical IDP, and fibroadenoma but absent in all carcinomas. Intraductal papilloma can be distinguished from fibroadenoma by their broad ruffled branches, scalloped borders, and tiny tongue-like projections. True papillae were commonly covered by tall columnar cells. Myoepithelial cells were few in IDP but were numerous in fibroadenoma. The epithelial fragments in nonpapillary lesions presented as cellular spheres and/or complex sheets with finger-like projections but lacked FVCs and columnar cells.
Papillary breast neoplasms can be accurately classified by cytology. Closer evaluation of the tissue fragments architecture and the background can help in separating PBN from their mimics. Cancer (Cancer Cytopathol) 2002;96:000–000. © 2002 American Cancer Society.