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Journal of the American Academy of Dermatology
Volume 74, n° 6
pages 1114-1120 (juin 2016)
Doi : 10.1016/j.jaad.2015.12.045
accepted : 24 December 2015
Original Articles

Concordance of handheld reflectance confocal microscopy (RCM) with histopathology in the diagnosis of lentigo maligna (LM): A prospective study
 

Tyler D. Menge, BA a, Brian P. Hibler, BS b, Miguel A. Cordova, MD b, Kishwer S. Nehal, MD b, Anthony M. Rossi, MD b,
a University of Michigan Medical School, Ann Arbor, Michigan 
b Dermatology Service, Memorial Sloan Kettering Cancer Center, New York, New York 

Reprint requests: Anthony M. Rossi, MD, Dermatology Service, Memorial Sloan Kettering Cancer Center, 16 E 60 St, New York, NY 10022.Dermatology ServiceMemorial Sloan Kettering Cancer Center16 E 60 StNew YorkNY10022
Abstract
Background

Reflectance confocal microscopy (RCM) provides real-time noninvasive imaging of cell structure and may be useful in diagnosing lentigo maligna (LM). Few studies have compared performance of RCM with histopathology in diagnosing LM, and specific features influencing RCM interpretation are not well described.

Objective

We sought to determine concordance rate between RCM and histopathology in the evaluation of suspected LM and to identify factors that may obscure diagnosis.

Methods

We designed a prospective study involving 17 participants seen for evaluation at a large tertiary referral center. Cases included primary lesions and possible recurrent and/or previously treated lesions. A total of 63 clinically equivocal sites were assessed by RCM and histopathology.

Results

RCM and histopathology interpretations were concordant in 56 of 63 sites (89%). There were no false-negative and 7 false-positive results using RCM (sensitivity 100%, specificity 71%, positive predictive value 85%, negative predictive value 100%). Features suggestive of LM in the false-positive group included the presence of numerous hyperreflectile large cells at the dermoepidermal junction and follicular localization of these cells.

Limitations

A larger test set is needed to more reliably distinguish LM from benign lesions using RCM and to improve specificity.

Conclusion

RCM shows excellent sensitivity for detecting LM although features of benign macules on a background of actinically damaged skin can obscure diagnosis and limit its specificity.

The full text of this article is available in PDF format.

Key words : confocal laser scanning microscopy, diagnosis, histopathology, lentigo maligna, melanoma, nevi, pigmented lesions, reflectance confocal microscopy



 Supported in part by the Memorial Sloan Kettering Cancer Center Support Grant/Core Grant (P30 CA008748).
 Conflicts of interest: None declared.



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