Large congenital melanocytic nevus

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Synonyms: Congenital pigmented nevus | GMN | Giant congenital melanocytic nevus | Giant pigmented hairy nevus | LCMN

A rare skin hamartoma characterized by at least one pigmented skin lesion present at birth of more than 20 cm (large congenital melanocytic nevus; LCMN) or 40 cm (giant; GCMN) projected adult diameter. The primary lesion is composed of mutated melanocytes and often locally disorganized epidermal annexes or dermis and presents with an elevated risk of malignant transformation to melanoma or more rarely other neoplasms in skin or central nervous system.

Data from Orphanet are used to provide information on a disease's name, synonym(s), and overview. Reference: Access aggregated data from Orphanet at Orphadata. Orphadata: Free access data from Orphanet. © INSERM 1999. Available on Data version July 2024

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Large congenital melanocytic nevus?

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