Figure 1.

a) Gross appearance, cut surface solid, green, firm, and well-circumscribed. b) Neoplastic cells are surrounding without involvement of duct or lobular structures (H&E 100×). c) The cells are of intermediate size with scant cytoplasm, irregular nuclei, clumped chromatin, and small nucleoli; some cells contain eosinophilic granules (H&E 400×). d) Myeloperoxidase reactivity is intensively positive in neoplastic cells (400×).