Lentigo maligna melanoma (melanoma on chronically sun-damaged skin of the head, neck)
Below are dermoscopic features commonly associated with the diagnosis “Lentigo maligna melanoma (melanoma on chronically sun-damaged skin of the head/neck)”.[1] The example images have been approved by a panel of experts as representative of each given feature.
For a more in-depth discussion of associated features, please see the Dermoscopedia pages for “Lentigo maligna” and "Melanoma on sun damaged skin".
Annular-granular pattern (gray dots around follicular openings)
a) Dots aggregated around adnexal openings and/or b) short and polygonal lines around and between adnexal openings.[2]
Asymmetric pigmentation around follicular openings
Crescent-shaped pigmentation that accentuates in only one portion of the follicular opening.[3]
Rhomboidal structures (angulated lines)
Angulated lines: short, pigmented lines around and between adnexal openings.[4]
Rhomboidal structures: Elongation, thickening, and merging of the short polygonal lines around adnexal openings form a polyhedral-shaped structures.[5]
Circle within a circle (isobar)
Dark blotches with or without obliterated hair follicles
- ↑ Fried LJ, Tan A, Berry EG, et al. Dermoscopy Proficiency Expectations for US Dermatology Resident Physicians: Results of a Modified Delphi Survey of Pigmented Lesion Experts. JAMA Dermatol. Published online January 06, 2021. doi:10.1001/jamadermatol.2020.5213
- ↑ https://dermoscopedia.org/Lentigo_Maligna#Annular-granular_pattern
- ↑ https://dermoscopedia.org/Lentigo_Maligna#Hyperpigmented_follicular_openings
- ↑ https://dermoscopedia.org/Lentigo_Maligna#Short_and_polygonal_lines_around_and_between_adnexal_openings.
- ↑ https://dermoscopedia.org/Lentigo_Maligna#Pigmented_rhomboidal_structures
