Low-Grade Fibromatosis-Like Spindle Cell Carcinoma of the Breast: a Mimicker of Benign Mesenchymal Tumors

Hsing Yu Chen, Thi Minh Thuc Nguyen, I. Wei Chang

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We described a case of low-grade fibromatosis-like spindle cell carcinoma (FLSCC) of the breast of a 49-year-old woman, which was diagnosed by excisional biopsy. The histopathology was characterized by bland neoplastic spindle cells with mild or no nuclear atypia, mimicking a benign mesenchymal tumor. An immunopanel of markers including pancytokeratin, p63, smooth muscle actin (SMA), CD10, and β-catenin was performed to establish the diagnosis and exclude other mimickers. The patient subsequently received modified radical mastectomy and was alive without disease for 10-year follow-up. Low-grade fibromatosis-like spindle cell carcinoma is a rare subtype of metaplastic carcinomas of the breast and typically occurs as palpable breast mass in an older woman. It can be histologically confused with nodular fasciits, desmoids-type fibromatosis, and inflammatory myofibroblastic tumor. Immunohistochemical study was essential for a correct diagnosis. It behaves as a locally aggressive disease but with a low potential of regional lymph node or distant metastasis.

Original languageEnglish
JournalIndian Journal of Surgery
Publication statusAccepted/In press - Jan 1 2020



  • Breast cancer
  • Fibromatosis-like
  • Metaplastic carcinoma
  • Spindle cell

ASJC Scopus subject areas

  • Surgery

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