A new dermoscopic algorithm for the differential diagnosis of facial lentigo maligna and pigmented actinic keratosis

Tamara Micantonio, Luca Neri, Caterina Longo, Simone Grassi, Alessandro Di Stefani, Ambra Antonini, Valeria Coco, Maria Concetta Fargnoli, Giuseppe Argenziano, Ketty Peris

Research output: Contribution to journalArticlepeer-review

Abstract

Background: The clinical and dermoscopic diagnosis of facial lentigo maligna (LM) and pigmented actinic keratosis (PAK) remains challenging, particularly at the early disease stages. Objectives: To identify dermoscopic criteria that might be useful to differentiate LM from PAK, and to elaborate and validate an automated diagnostic algorithm for facial LM/PAK. Materials & Methods: We performed a retrospective multicentre study to evaluate dermoscopic images of histologically-proven LM and PAK, and assess previously described dermoscopic criteria. Results: In the first part of the study, 61 cases of LM and 74 PAK were examined and a parsimonious algorithm was elaborated using stepwise discriminant analysis. The following eight dermoscopic criteria achieved the greatest discriminative power: (1) light brown colour; (2) a structureless zone, varying in colour from brown to brown/tan, to black; (3) in-focus, discontinuous brown lines; (4) incomplete brown or grey circles; (5) a structureless brown or black zone, obscuring the hair follicles; (6) a brown (tan), eccentric, structureless zone; (7) a blue structureless zone; and (8) scales. The newly developed algorithm was subsequently validated using an additional series of 110LMand 75 PAKcases. Diagnostic accuracy was 86.5% (k: 0.73, 95% CI: 0.63-0.83). For the diagnosis of LM vs PAK, sensitivity was 82.7% (95% CI: 75.7-89.8%), specificity was 92.0% (95% CI: 85.9-98.1%), positive predictive value was 93.8% (95% CI: 89.0-98.6%), and negative predictive value was 78.4% (95% CI: 68.4-86.5%). Conclusions: This algorithm may represent an additional tool for clinicians to distinguish between facial LM and PAK.

Original languageEnglish
Pages (from-to)162-168
Number of pages7
JournalEuropean Journal of Dermatology
Volume28
Issue number2
DOIs
Publication statusPublished - Mar 1 2018

Keywords

  • dermoscopic algorithm
  • dermoscopy
  • lentigo maligna
  • lentigo maligna melanoma
  • pigmented actinic keratosis

ASJC Scopus subject areas

  • Dermatology

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