A complex association between derivatives from the neural crest. A case report.

We report the case of a very complex proliferation arose in the context of the soft tissues of the axilla, composed of elements derived from the neural crest: several of hamartomatous significance: ("cafe au lait spots without neurofibroma, groups of nevoids cells), others clearly neoplastic with the characters of the melanoma and the MPNST. The melanoma cells express, furthermore, neuroendocrine markers. Differential diagnostic characters are discussed and emphasizes the importance of this kaleidoscopic, transient, structure in determining the phylogeny and ontogeny of living beings.