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Arch Dermatol. 2007;143(7):937-942.

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Diagnosis: Subungual blue nevus.

MICROSCOPIC FINDINGS

Histopathologically, there was a proliferation of spindle-shaped melanocytes with prominent dendrites containing abundant melanin and arranged haphazardly in the reticular dermis with thick collagen bundles and fibrosis at the periphery. Some melanocytes showed prominent nucleoli and rare mitoses. Abundant melanophages were also seen. No cytologic atypia was found. The final diagnosis was subungual common blue nevus. The lesion was completely removed. Two years later, the patient was in good health, and her fingernail was growing normally without any residual dystrophy.

DISCUSSION

Blue nevus is either a congenital or an acquired benign skin tumor characterized by dermal proliferation of melanocytes. It may occur anywhere on the skin but has also been found in the oral cavity, genitalia, lymph nodes, prostate gland, and pulmonary tract. Subungual localization of a blue nevus was first described by Baran and Dawber¹ in 1994. The authors reported a combined dysplastic and blue nevus in a 4-year-old girl . . . [Full Text of this Article]

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Arch Dermatol. 2007;143(7):937-942.
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