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Table 2 ELM-based risk classification for cutaneous pigmented lesions

From: The role of spectrophotometry in the diagnosis of melanoma

MELANOCYTIC LESIONS ELM FEATURES
Type 1
(very high risk)
Lesion with a pigment network and any of the classical ELM features specific for melanoma (pseudopods, radial streaming, blue-gray veil, atypical vessel, etc.)
Type 2
(high risk)
Lesion with a pigment network and subtle new ELM features that may suggest melanoma but often are also seen in atypical nevi.
Type 3
(medium risk)
Lesion with a pigment network carrying subtle perturbations that can be detected in atypical naevus as well as in melanocytic hyperplasia.
Type 4
(low risk)
Lesion with a benign appearing network.
Type 5
(very low risk)
Lesion with a benign appearing network and with a globular pattern or another benign ELM pattern.