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(a) Hyperkeratosis with thin anastomosing strands of cuboidal cells extending from the epidermis to the upper dermis (H&E stain, original magnification × 2). (b) Hematomas in the intracorneal region and upper dermis (H&E stain, original magnification × 4). (c) The cells of the ductal and cystic structures (d) were positive for CEA (original magnification × 20).
