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Metastatic breast carcinoma mixed with metastatic papillary thyroid carcinoma in a neck lymph node. a Metastatic breast carcinoma cells infiltrate the stroma (asterisk) and also extend between the papillary fronds of papillary thyroid carcinoma. b A TTF-1 immunohistochemical stain highlights the tumor cells of the thyroid cancer. c An estrogen receptor immunohistochemical stain highlights the breast cancer cells (asterisk) (all figures 10× magnification)
