Prevalence of 13 histological parameters in 9 malignant melanomas in situ
| Feature | Prevalence | % |
|---|---|---|
| NA, not applicable. | ||
| Cytological atypia | 9 | 100 |
| Dermal lymphocytic infiltrate | 9 | 100 |
| Irregular and confluent nests | 9 | 100 |
| Single melanocytes predominating | 8 | 88.9 |
| Suprabasal melanocytes | 7 | 77.8 |
| Asymmetry | 7 | 77.8 |
| Poor circumscription | 6 | 66.7 |
| Dimension >6 mm | 4 | 44.5 |
| Asymmetrical melanin | 3 | 33.4 |
| Melanin in deep cells | NA | – |
| Absence of maturation | NA | – |
| Mitoses | NA | – |
| Necrosis | NA | – |