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Melanoma in situ, left forearm (case 2). A, Melanocytes are arranged in nests and singly along the dermoepidermal junction. The melanocytes are cytologically atypical and display pagetoid upward extension (hematoxylin-eosin, original magnification ×100). B, MART-1 stain (melanoma antigen recognized by T cells) highlighting pagetoid spread of cytologically atypical melanocytes (original magnification ×40).
