congenital melanocytic nevus
Pronunciation: mel-uh-noh-SIT-ik NEE-vus
A pigmented birthmark present at birth, classified by size and carrying varying risks of malignant transformation.
Full Definition
Congenital melanocytic nevi are pigmented lesions present at birth, affecting approximately 1% of newborns. They are classified as small (<1.5 cm), medium (1.5-19.9 cm), or large/giant (≥20 cm) based on their predicted adult size. Large congenital nevi carry increased risks of malignant transformation and neurocutaneous melanosis, requiring careful monitoring and often prophylactic excision. Small congenital nevi have minimal malignant potential. Medical writers must understand the size-based risk stratification and the difference between congenital and acquired melanocytic nevi for accurate clinical communication.
Usage
Usage note: Plural: congenital melanocytic nevi. Often abbreviated as CMN. Note the specific size classifications for risk stratification.
In Context
- "The large congenital melanocytic nevus required pediatric dermatology referral for malignancy risk assessment." — primary care referral
- "Small congenital melanocytic nevi have minimal malignant potential and can be monitored clinically." — clinical guideline