Large Congenital Melanocytic Nevus on the Breast Sparing the Nipple and Areola

摘要

BackgroundDivided nevus is a rare entity that has been described for a special appearance of congenital melanocytic nevi (CMNs) occurring on the eyelid and penis. It is presumed that the formation of divided nevi is related with the embryologic development of the eyelid and penis, thus giving a hint about the occurrence time of CMN in utero. This article focuses on a formerly undescribed observation of another special clinical appearance of CMN discussing possible relation with embryogenesis.