Yunmin Zou, Xiaohong Zhu, Rushan Xia

Concordance between reflectance confocal microscopy and histopathology for the diagnosis of acral lentiginous melanoma

  • Dermatology

AbstractBackgroundAcral lentiginous melanoma (ALM) is a highly malignant and invasive type of melanoma with unique locations of onset. Its incidence is increasing and early diagnosis is challenging. Reflectance confocal microscopy (RCM) is a non‐invasive technique that provides an accurate image of tissue pathology. There are few reports on the use of RCM for the assessment of ALM.Materials and methodsIn this retrospective study, data from 31 patients with a clinical diagnosis of ALM were collected. RCM image features were compared with histopathological findings to determine the concordance between the two methods. The sensitivity, specificity, positive predictive value, and negative predictive value of RCM for the diagnosis of ALM were evaluated.ResultsRCM and histopathology findings were concordant in 29 of 31 patients (93.5%). There were no false‐negative results, although there were two false positives in RCM diagnosis. The sensitivity of RCM for diagnosing ALM was 100%, specificity was 50%, positive predictive value was 93.1%, and negative predictive value was 100%.ConclusionsRCM showed substantial concordance with histopathology in the diagnosis of ALM. It is a reliable and valuable non‐invasive diagnostic tool that holds promise for the early diagnosis of ALM.

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