Giant congenital melanocytic nevus

Area of Science:

• Dermatology
• Oncology
• Pediatrics

Background:

• Giant congenital melanocytic nevus (GCMN) is a rare birthmark defined by its large size (≥ 20 cm in adulthood).
• It affects fewer than 1 in 20,000 newborns and can cause significant psychosocial impact.
• Potential severe complications include malignant melanoma and neurocutaneous melanosis.

Purpose of the Study:

• To summarize the key aspects of GCMN, including definition, incidence, clinical presentation, and histological differences from acquired nevi.
• To discuss the associated risks, particularly malignant melanoma development.
• To outline current management strategies, emphasizing individualized treatment approaches.

Main Methods:

• Clinical diagnosis is primary for GCMN.
• Histological examination distinguishes GCMN by size, deep nevus cell spread, and varied architecture.
• Literature review on risk factors, complications, and treatment options.

Main Results:

• GCMN presents as a brown, well-demarcated lesion, often with hypertrichosis.
• The lifetime risk of developing melanoma from GCMN is estimated between 5-10%, though this remains controversial.
• Management is individualized, involving surgery, non-surgical options, psychological support, and vigilant follow-up.

Conclusions:

• GCMN requires personalized management due to potential complications and psychosocial effects.
• Early detection of changes in the nevus is crucial for timely intervention.
• Surgical intervention is solely indicated for malignant neoplasm development within the GCMN.