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July 2007

A Blue-Gray Subungual Discoloration—Diagnosis

Author Affiliations
 

MICHAEL E.MINGMD, MSCE

Arch Dermatol. 2007;143(7):937-942. doi:10.1001/archderm.143.7.937-h

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.

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