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. 2024 Mar 18;14:1364011. doi: 10.3389/fonc.2024.1364011

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Copyright © 2024 Laokulrath, Lim, Lim, Gudi and Tan

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Breast core biopsies illustrate the invasive carcinoma, showing perilobular infiltration (A) and involvement of a fibroadenoma (B). Multiple foci of lymphovascular invasion are evident (arrowheads) (C). Distinctive features include dense collagenous bands encircling some glands, resembling a basement membrane with stretched-out and compressed cells (arrowheads), akin to myoepithelial cells (D). A few glands are partially lined by columnar cells with lower-grade nuclei and abundant basophilic apical mucin, transitioning seamlessly into highly pleomorphic epithelial cells (E). IHC results demonstrate scattered positivity for smooth muscle myosin heavy chain (SMMHC) (F) and cytokeratin 5 (CK5) (G) around the tumour nests. Carcinoma cells display positive staining for CA125 (H) and PAX8 (I).