- Among all congenital nevi, the exact increase in melanoma risk is estimated at less
than 1%, and among patients with small and medium-sized congenital nevi, this risk is
virtually entirely after the patient reaches puberty - In 2013, Vourc’h-Jourdain and colleagues20 performed a metaanalysis
of studies published between 1966 and 2011 to examine melanoma risk for
patients with congenital melanocytic nevi larger than 20 cm in size, and reported
that 2% of 2578 patients developed melanomas, of which 74% had a nevus larger
than 40 cm in size and 94% had satellite nevi. - In 2013, new recommendations were prepared for the categorization of cutaneous
features of congenital melanocytic nevi with division of medium (M1: 1.5–10 cm,
M2: >10–20 cm), large (L1: >20–30 cm, L2: >30–40 cm), and giant (G1: >40–
60 cm, G2: >60 cm) sized nevi