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Original Investigation
October 11, 2017

Correlation of Handheld Reflectance Confocal Microscopy With Radial Video Mosaicing for Margin Mapping of Lentigo Maligna and Lentigo Maligna Melanoma

Author Affiliations
  • 1Dermatology Service, Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, New York
  • 2Dermatology Department, Hospital Clínic, Universitat de Barcelona, Barcelona, Spain
JAMA Dermatol. Published online October 11, 2017. doi:10.1001/jamadermatol.2017.3114
Key Points

Question  Is handheld reflectance confocal microscopy with radial video mosaicing accurate for noninvasive delineatation of subclinical lentigo maligna and lentigo maligna melanoma borders and estimation of its margins?

Findings  In this study, 23 lentigo maligna and lentigo maligna melanoma lesions from 22 patients were evaluated. Overall, controlling for patient age and previous surgery, surgical margins were a mean of 0.76 mm larger than the estimate obtained with reflectance confocal microscopy.

Meaning  Handheld reflectance confocal microscopy with radial video mosaicing findings correlated well with histologic findings and may be useful in planning treatment and counseling patients.

Abstract

Importance  The management of lentigo maligna (LM) and LM melanoma (LMM) is challenging because of extensive subclinical spread and its occurrence on cosmetically sensitive areas. Reflectance confocal microscopy (RCM) improves diagnostic accuracy for LM and LMM and can be used to delineate their margins.

Objectives  To evaluate whether handheld RCM with radial video mosaicing (HRCM-RV) offers accurate presurgical assessment of LM and LMM margins.

Design, Setting, and Participants  This prospective study included consecutive patients with biopsy-proven LM and LMM located on the head and neck area who sought consultation for surgical management from March 1, 2016, through March 31, 2017, at the Dermatology Service of the Memorial Sloan Kettering Cancer Center. Thirty-two patients underwent imaging using HRCM-RV, and 22 patients with 23 LM or LMM lesions underwent staged surgery and contributed to the analysis.

Main Outcomes and Measures  Clinical lesion size and area, LM and LMM area based on HRCM-RV findings, surgical defect area estimated by HRCM-RV, and observed surgical defect area. In addition, the margins measured in millimeters estimated for tumor clearance in each quadrant based on HRCM-RV findings were calculated and compared with the surgical margins.

Results  Among the 22 patients (12 men and 10 women; mean [SD] age, 69.0 [8.6] years [range, 46-83 years]) with 23 lesions included in the final analysis, the mean (SD) surgical defect area estimated with HRCM-RV was 6.34 (4.02) cm2 and the mean (SD) area of surgical excision with clear margins was 7.74 (5.28) cm2. Overall, controlling for patient age and previous surgery, surgical margins were a mean of 0.76 mm (95% CI, 0.67-0.84 mm; P < .001) larger than the HRCM-RV estimate.

Conclusions and Relevance  Mapping of LM and LMM with HRCM-RV estimated defects that were similar to but slightly smaller than those found in staged excision. Thus, mapping of LM using HRCM-RV can help spare healthy tissue by reducing the number of biopsies needed in clinically uncertain areas and may be used to plan treatment of LM and LMM and counsel patients appropriately.

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