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23 February 2018 : Case report  China (mainland)

Breast Metaplastic Squamous Cell Carcinoma Diagnosed with Fine Needle and Core Biopsy: A Case Study

Challenging differential diagnosis, Unusual or unexpected effect of treatment, Rare disease

Na Cha1AEF, Shiyu Wang2EF, Ming Lv3DF, Dong-Wei Wang1AB, Xiao-Jie Zhang4B, Min Zheng4A, Li-Xiang Tian1DE*

DOI: 10.12659/AJCR.907254

Am J Case Rep 2018; 19:203-206

Abstract

BACKGROUND: Breast metaplastic squamous cell carcinoma (SCC) is a rare primary breast carcinoma, and overexpression of HER2 in this carcinoma is extremely uncommon.

CASE REPORT: We presented a case of a 48-year-old Asian female with breast metaplastic SCC. Fine needle aspiration biopsy (FNAB) and core needle biopsy (CNB) of the lesion were taken prior to surgical resection. FNAB smears demonstrated highly atypical squamous cells and a diagnosis positive for malignancy was rendered. CNB and a surgical resection specimen revealed invasive squamous carcinoma with keratin pearl formation and intercellular bridges. Further study demonstrated this was an unusual metaplastic SCC case with basal-HER2 (+) phenotype. HER2 has been linked to poor prognosis and response to therapy.

CONCLUSIONS: The pathological diagnosis of the breast metaplastic SCC was made initially by FNAB and CNB. Identification of basal-HER2 (+) phenotype was critical for selection of hormonal therapies and chemotherapy.

Keywords: Genes, erbB-2, Mass Behavior, Metaplasia, Neoplasms, Squamous Cell

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American Journal of Case Reports eISSN: 1941-5923
American Journal of Case Reports eISSN: 1941-5923