Blue nevus of the uterine cervix.

A case of blue naevus of the endocervix is reported with immunohistochemical and ultrastructural findings. The dendritic melanin-containing cells are analogous to the blue naevi cells of the skin. Electron microscopy showed melanosomes in dendritic cells but no cells with melanin-producing Schwann cells features were observed. Histogenetic hypotheses are discussed.