Virchows Archiv

, Volume 451, Issue 5, pp 883–891

Flat DIN 1 (flat epithelial atypia) on core needle biopsy: 63 cases identified retrospectively among 1,751 core biopsies performed over an 8-year period (1992–1999)

  • Maritza Martel
  • Patricia Barron-Rodriguez
  • Idris Tolgay Ocal
  • Jorge Dotto
  • Fattaneh A. Tavassoli
Original Article

DOI: 10.1007/s00428-007-0499-z

Cite this article as:
Martel, M., Barron-Rodriguez, P., Tolgay Ocal, I. et al. Virchows Arch (2007) 451: 883. doi:10.1007/s00428-007-0499-z

Abstract

Uniform management of flat DIN 1 (flat epithelial atypia) on core needle biopsy (CNB) concerning surgical excision or clinical follow-up are lacking. In a retrospective review of 1,751 CNB over an 8-year period, we found 63 cases with flat DIN 1 as the most advanced lesion; follow-up was available in 55 cases. Of the 63 patients, 24 had a subsequent biopsy for 15 days to 10 years after the initial CNB, an infiltrating carcinoma was found in nine (14.3%) patients, seven (11.1%) in the ipsilateral, and two (3.2%) in the contralateral breast. Five underwent an excisional biopsy of the ipsilateral breast within less than 3 months of the initial CNB; none had either an invasive or intraepithelial carcinoma. Based on our findings, we consider flat DIN 1 a marker of slightly increased risk for subsequent development of invasive breast carcinoma. When flat DIN 1 is found on CNB as the most advanced lesion after mammographic correlation, an excisional biopsy is not mandatory; however, close follow-up is advised with repeat mammograms for early detection of any clinically occult carcinoma in the vicinity of flat DIN 1 that may have been missed by the CNB.

Keywords

Flat epithelial atypia Flat DIN 1 Core needle biopsy Breast carcinoma Ductal intraepithelial neoplasia 

Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  • Maritza Martel
    • 1
  • Patricia Barron-Rodriguez
    • 1
  • Idris Tolgay Ocal
    • 1
  • Jorge Dotto
    • 1
  • Fattaneh A. Tavassoli
    • 1
  1. 1.Department of PathologyYale University School of MedicineNew HavenUSA

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