Lentigo Maligna: Contemporary Surgical Management and Outcome: A Review

Lentigo maligna (LM) is the commonest melanoma in situ variant and frequently arises on chronically sun-exposed facial skin, where subclinical radial spread and background actinic melanocytic atypia complicate both surgical clearance and histological interpretation. The aim of this study is to appraise contemporary surgical options for LM and their oncological outcomes, focusing on conventional wide local excision (WLE), Mohs micrographic surgery (MMS), Paraffin embedded margin-controlled ("slow Mohs") techniques and staged excision (SE).

A comprehensive search of PubMed and Web of Science (January 2015-January 2025) retrieved retrospective cohorts, systematic reviews and meta-analyses that detailed technique, margin policy and outcomes for LM or lentigo maligna melanoma (LMM). Forty-six studies met prespecified criteria and were synthesised qualitatively.

WLE remains the most widely performed procedure but showed the greatest heterogeneity in practice. Initial clinical margins of 5 mm often required histological extensions to 7-12 mm to secure clearance; under WLE, residual disease rates reached 16.7% and recurrences ranged from 5.7% to 27.3%. In contrast, MMS, especially when using immunohistochemistry, achieved recurrence rates between 0-3% with ≥5 years of follow-up. Slow Mohs and staged excision provided intermediate recurrence control (0-5.7%) while preserving tissue but were limited by procedural variability and delayed reconstruction. Although one retrospective study reported improved disease-specific survival with MMS, most studies showed no significant differences in melanoma-specific or overall survival across surgical techniques. Limited long-term follow-up and inconsistent statistical reporting (e.g., confidence intervals) were common.

Margin-controlled approaches (MMS, slow Mohs, SE) afford superior local control to WLE and are preferable for lesions on cosmetically or functionally critical sites. Because survival appears equivalent, the choice of technique should be guided by anatomical location, lesion size, available expertise, patient characteristics and preferences as well as cost-effectiveness and available resources. Well-designed prospective trials with standardised protocols are essential to refine margin recommendations and compare long-term outcomes.