Nevus Outreach, Inc., The association for Large Nevi and related disorders.
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CMN Classification


CMN projected adult size
"Small CMN (SCMN)"   <1.5 cm
“Medium CMN (MCMN)” “M1” 1.5-10 cm
“M2” >10-20 cm
“Large CMN (LCMN)” “L1” >20-30 cm
“L2” >30-40 cm
“Giant CMN (GCMN)” “G1” >40-60 cm
“G2” >60 cm
“multiple MCMN” 3 or more MCMN without a single, predominant CMN
CMN localization1
CMN of the head “face”; “scalp”
CMN of the trunk “neck”, “shoulder”, “upper back”, “middle back”, “lower back”, “breast / chest”, “abdomen”, “flank”, “gluteal region”, “genital region”
CMN of the extremities “upper arm”, “forearm”, “hand”, “thigh”, “lower leg”, “foot”
Number of satellite nevi2
“S0” No satellites
“S1” <20 satellites
“S2” 20-50 satellites
“S3” >50 satellites
Additional morphological characteristics
“C0”, “C1”, “C2” none, moderate, marked color heterogeneity
“R0”, “R1”, “R2” none, moderate, marked surface rugousity
“N0”, “N1”, N2” none, scattered, extensive dermal or subcutaneous nodules
“H0”, “H1”, “H2” none, notable, marked hypertrichosis (“hairiness”)

1One or more of these localizations should be used to describe the preponderant area of involvement
2Refers to the number of satellites within the first year of life; in case this number is not available, the actual number should be mentioned

Graph chart showing the relation between diameter and age for congenital melanocytic nevi located on the head
Graph chart showing the relation between diameter and age for congenital melanocytic nevi located on the trunk and arms
Graph chart showing the relation between diameter and age for congenital melanocytic nevi located on the legs

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