Montgomery

 
"One sees [in early melanoma] large atypical cells with relatively little pigment or even with mitotic figures, but apparently they still are confined within the epidermis." Montgomery H. Dermatopathology. New York: Harper and Row Publishers, 1967:1175.
 

Brief Critique

 
The three findings do not permit a melanoma in situ to be distinguished from some examples of Spitz's nevus confined to epidermal and adnexal epithelium.