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Synchronous squamous cell carcinoma of the breast and invasive lobular carcinoma

Squamous cell carcinoma (SCC) is an uncommon breast carcinoma with a variable proportion of ductal carcinoma cells mixed with tumor cells of squamous differentiation forming a mature keratinizing tissue. SCC tends to grow rapidly, and lymph node metastasis is reported to occur in approximately 54% of cases (1). Invasive lobular carcinoma (ILC) is the second most common type of breast cancer after invasive ductal carcinoma (IDC). The classic form of ILC is characterized by the ‘‘Indian file’’ growth pattern; that is, small, relatively uniform, neoplastic cells invade the stroma, resulting in linear strands of cells. We encountered an SCC