benign melanocytic nevus

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  • Histology

    • small, circumscribed, involves rete tips/sides
    • well nested, round/oval nests
    • has maturation and dispersion
      • maturation = smaller and spindled melanocytes at the bottom
      • disperses to single units at base of lesion
    • lacks deep mitosis or pigmentation
  • Stains

    • HMB45 top heavy
    • MIB1 spares deep nuclei