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Metastatic lobular carcinoma. Bland-appearing tumor cells are arranged in strands with occasional single-signet ring-like cells, invading the stroma (hematoxylin & eosin, Nikon E1000, original magnification ×100) (a) and metastatic cells stain positively for apocrine marker GCDFP-15 (Nikon E1000, original magnification ×100) (b).
