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(a) Adenoid-basal pattern with intertwining strands of basaloid cells forming gland-like structures at places with some of the tumor cells showing melanin pigment production. (H and E, ×100). (b) Fibroepithelioma-like pattern seen in some areas. (H and E, ×100). (c) Tumor cells showing positivity for Ber EP-4 on immunohistochemistry (IHC, ×400)
