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Related Experiment Video

Updated: Jun 20, 2026

A Patient-Derived Xenograft Model for Venous Malformation
06:51

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Published on: June 15, 2020

[Controversial issues in congenital nevi].

S Paradela1, R Fernández-Torres, E Fonseca

  • 1Servicio de Dermatología. Complejo Hospitalario Universitario Juan Canalejo, La Coruña, España.

Actas Dermo-Sifiliograficas
|September 1, 2009
PubMed
Summary

The risk of melanoma developing from giant congenital melanocytic nevi (GCMN) is lower than previously believed. Prophylactic surgery for GCMN should be individualized based on melanoma suspicion and consequences.

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Area of Science:

  • Dermatology
  • Oncology
  • Pathology

Background:

  • Congenital melanocytic nevi (CMN) are common skin lesions with debated risks.
  • Giant congenital melanocytic nevi (GCMN) and small congenital melanocytic nevi (SCMN) present distinct clinical concerns regarding malignant transformation.

Purpose of the Study:

  • To systematically review the literature on melanoma risk associated with congenital melanocytic nevi.
  • To provide evidence-based recommendations for the management of GCMN and SCMN.

Main Methods:

  • Systematic literature review of studies reporting melanoma development in patients with GCMN.
  • Review of biopsy series linking melanoma to SCMN.

Main Results:

  • Melanoma developed in only 2% of recent GCMN series, primarily before age 5.
  • Small congenital melanocytic nevi are associated with 7-8% of melanoma cases, with potential malignant conversion risk from age 10 onwards.

Conclusions:

  • Prophylactic surgery for GCMN should be individualized, considering clinical suspicion of melanoma and esthetic/functional impacts.
  • Regular monitoring and prophylactic excision are recommended for SCMN, particularly around puberty, due to potential malignant conversion risks.