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Photomicrograph of malignant melanoma (a) tumor cells arranged in nests and cords (Hematoxylin and eosin [H and E], × 100). (b) Tumor cells showing pleomorphic nuclei with prominent nucleoli and intracytoplasmic melanin pigment (H and E, × 400). Photomicrograph of hidradenocarcinoma (c) tumor cells (white arrow) with fibrovascular collagenous stroma (black arrow) (H and E, × 40). (d) Tumor cells arranged in sheets and areas of tumor necrosis (black arrow) (H and E, × 40)
