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Figure 2b.  (a) Photomicrograph (original magnification, x5; hematoxylin-eosin stain) shows infiltrative growth of tubular carcinoma into adjacent fat; this growth pattern gives the lesion its spiculated appearance. (b) Photomicrograph (original magnification, x200; hematoxylin-eosin stain) shows tubules with patent lumina and angulated borders. The individual cells show low-grade cytologic features with little nuclear pleomorphism.