This simple 10-minute course into melanoma diagnosis using the 7-point checklist will give you an overview of pattern analysis. The 7-point checklist provides a simplification of standard pattern analysis because of the low number of features, or criteria, to identify. As with the ABCD rule, it can be easily learned and applied and has proven to be reliable in diagnosing melanoma.
Scoring Method for Diagnosis
Major ELM Criteria
Atypical pigment network
Atypical vascular pattern
Minor ELM Criteria
Radial streaming (streaks)
Irregular diffuse pigmentation (blotches)
Irregular dots and globules
The score for criterion presence is determined on the basis of the odds ratio.
Odds ratios measure the capacity of each criterion of increasing the probability of a positive melanoma diagnosis.
By simple addition of the criteria scores, a minimum total score of 3 is required for the diagnosis of melanoma.
Major Criteria - Atypical Pigment Network
Definition Prominent (hyperpigmented or broad) and irregular network
Histological Correlates Hyperpigmented or broadened rete ridges with irregular shape or distribution