| 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
