Abstract
Abstract Mammary carcinoma with Osteoclast Giant Cells (OGCs) is a rare tumour. Although several cases were reported, the significance of this histological finding remains incompletely understood. OGCs may occur in several types of breast carcinoma with different epidemiological characteristics but, in association with pregnancy, OGCs has not been reported to date. Here we report a case 37-year-old presenting with a symptomatic breast lump in pregnancy that has been confirmed clinically and radiologically. Microscopic examination of biopsies and surgical specimens showed OGCs accompanying invasive ductal carcinoma with no evidence of axillary metastasis. Immunohistochemical analysis revealed tumour cells to be positive for oestrogen, and progesterone receptors, with human epidermal growth factor negative status (ER6, PR8, HER2 negative). This is the first case of OGCs during pregnancy to be reported, to our best of knowledge, following a search of the literature published in English language.
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