Melanoma associated with congenital intermediate common blue nevus of the scalp – Case report.

Autores: Ribeiro CS1, Serpa SS2, Sousa MA3, Jeunon T1

¹Hospital Federal de Bonsucesso – Rio de Janeiro (RJ), Brazil.
²Universidade Estácio de Sá – Rio de Janeiro (RJ), Brazil.
³Universidade do Estado do Rio de Janeiro (Uerj) – Rio de Janeiro (RJ), Brazil.

Melanomas can arise either de novo (70%) or from pre-existing melanocytic lesions (30%). Of the latter, most cases arise at the dermoepidermal junction from small congenital or acquired non-blue nevi while only a few arise from blue nevi, notably the cellular subtype and less commonly the common (dendritic) type. Melanomas that arise from blue nevi usually occur on the scalp with greater frequency, as in the case described. Although previous studies have discussed melanoma arising from giant congenital blue nevi, few have discussed those arising from intermediate blue nevi. We present a case of a 52-yearold man with melanoma on the scalp evolving from an intermediate congenital common blue nevus.