The following abstract is drawn from a recently published paper in Human Pathology | Journal | ScienceDirect.com by Elsevier. We invite you to read the full paper and join the conversation, become a member of the Pathology News community to share your thoughts, ask questions, and engage with others around this work.

Authors: Tristan Jordan, Yuanxin Liang, Lorraine Colón Cartagena, Natalia Buza, Uma Krishnamurti, Haiying Zhan

Abstract

Objective
Breast MRI is widely used for screening high-risk patients and for assessing the extent of disease in patients with breast cancer. The goal of this study was to determine the pathologic findings associated with MRI-guided core needle biopsies performed for non-mass enhancement (NME) lesions of the breast.

Methods
We retrospectively identified 270 MRI-guided core needle biopsies from 225 women performed at our institution between January 1, 2024, and Dec 30, 2025. All included cases demonstrated non-mass enhancement on MRI. Radiologic and pathologic findings were reviewed. Cases were divided into two groups: those with a recent diagnosis of ipsilateral malignancy (n = 74) and those without a recent diagnosis of malignancy (n =196).

Results
Biopsies from patients with a known ipsilateral malignancy demonstrated a higher frequency of invasive carcinoma (20% vs. 7%, p = 0.003) and in situ carcinoma (27% vs. 9%, p =0.0002) compared with those without ipsilateral malignancy, and a lower frequency of benign findings (46% vs. 77%, p = 0.0001). NME-associated invasive carcinomas were predominantly well- to moderately-differentiated carcinomas (96%) and were ER–positive/HER2-negative (>90%). NME-associated DCIS were 57% high grade, 43% intermediate grade, with 36% showing an ER-negative staining.

Conclusion
MRI-guided biopsies for NME lesions demonstrate a significant rate of malignancy, particularly in patients with known ipsilateral breast cancer. Most NME-associated malignancies are well- to moderately-differentiated, hormone receptor–positive/HER2-negative carcinomas, while a subset of high-grade, ER-negative DCIS highlights the heterogeneous nature of these lesions.

Read the full article: Pathologic Characterization of Non-Mass Enhancement Lesions of the Breast in MRI-guided Biopsy – ScienceDirect

Department of Pathology, Yale University School of Medicine, New Haven, CT, 06510