Malignant blue nevus.

A malignant blue nevus of the dorsum of the hand and a review of the literature is reported. Histopathologic examination showed the presence of a blue nevus and a cellular blue nevus, as well as a malignant blue nevus. The cellular blue nevus elements of the lesion showed the characteristic prominent neural-type fascicles intertwined with melanocytes. There was no evidence for local invasion or regional lymph node metastases. The patient was free of disease 1 year following wide excision.