- These lesions affect 1 in 30,000 – 100,000 individuals
- They are greater than 20cm in diameter
- These nevi often occur in association with smaller congenital nevi
- These lesions present a lifetime risk of MM estimated to be 6 – 10%
- The long term follow-up care is usually challenging
- When possible, a staged prophylactic removal is recommended
- The greatest risk of developing MM occurs before the age of 5yrs, with the next greatest chance occurring between 5 – 10 years of age
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