Automated evaluation system of dermoscopic images of longitudinal melanonychia

Proposition of a discrimination index for detecting early nail apparatus melanoma

Hiroshi Koga, Shunji Yoshikawa, Akihito Sekiguchi, Jyuzo Fujii, Toshiaki Saida, Takayuki Sota

    Research output: Contribution to journalArticle

    6 Citations (Scopus)

    Abstract

    The prognosis of nail apparatus melanoma is generally poor because of difficulty in early stage diagnosis. Most nail apparatus melanomas occur as longitudinal melanonychia, and criteria and algorithms for dermoscopy diagnosis of longitudinal melanonychia have only recently been proposed. However, as with any clinical diagnosis, the diagnosis based on dermoscopy is to some extent subjective. Our goal is to develop an automated dermoscopic screening system for longitudinal melanonychia and to propose a novel objective and quantitative index for discriminating early nail apparatus melanoma from benign longitudinal melanonychia including melanocytic nevus. We propose an automatically calculated index representing degrees of color variegation in dermoscopic images of longitudinal melanonychia. Dermoscopy images of six cases of early stage nail apparatus melanoma and 25 cases of benign longitudinal melanonychia were analyzed with our screening system and a threshold of melanoma discrimination index was determined. This single melanoma discrimination index diagnosed early nail apparatus melanoma with 100% sensitivity and 92% specificity. The automatically calculated index proposed in the present study is valuable for managing longitudinal melanonychia. The results suggest that the degree of color variegation is essentially different between early nail apparatus melanoma and benign longitudinal melanonychia including melanocytic nevus of the nail apparatus.

    Original languageEnglish
    Pages (from-to)867-871
    Number of pages5
    JournalJournal of Dermatology
    Volume41
    Issue number10
    DOIs
    Publication statusPublished - 2014

    Fingerprint

    Nails
    Melanoma
    Dermoscopy
    Pigmented Nevus
    Color
    Early Diagnosis
    Sensitivity and Specificity

    Keywords

    • Automated diagnostic method
    • Dermoscopy
    • Longitudinal melanonychia
    • Melanoma discrimination index
    • Nail apparatus melanoma

    ASJC Scopus subject areas

    • Dermatology

    Cite this

    Automated evaluation system of dermoscopic images of longitudinal melanonychia : Proposition of a discrimination index for detecting early nail apparatus melanoma. / Koga, Hiroshi; Yoshikawa, Shunji; Sekiguchi, Akihito; Fujii, Jyuzo; Saida, Toshiaki; Sota, Takayuki.

    In: Journal of Dermatology, Vol. 41, No. 10, 2014, p. 867-871.

    Research output: Contribution to journalArticle

    Koga, Hiroshi ; Yoshikawa, Shunji ; Sekiguchi, Akihito ; Fujii, Jyuzo ; Saida, Toshiaki ; Sota, Takayuki. / Automated evaluation system of dermoscopic images of longitudinal melanonychia : Proposition of a discrimination index for detecting early nail apparatus melanoma. In: Journal of Dermatology. 2014 ; Vol. 41, No. 10. pp. 867-871.
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    title = "Automated evaluation system of dermoscopic images of longitudinal melanonychia: Proposition of a discrimination index for detecting early nail apparatus melanoma",
    abstract = "The prognosis of nail apparatus melanoma is generally poor because of difficulty in early stage diagnosis. Most nail apparatus melanomas occur as longitudinal melanonychia, and criteria and algorithms for dermoscopy diagnosis of longitudinal melanonychia have only recently been proposed. However, as with any clinical diagnosis, the diagnosis based on dermoscopy is to some extent subjective. Our goal is to develop an automated dermoscopic screening system for longitudinal melanonychia and to propose a novel objective and quantitative index for discriminating early nail apparatus melanoma from benign longitudinal melanonychia including melanocytic nevus. We propose an automatically calculated index representing degrees of color variegation in dermoscopic images of longitudinal melanonychia. Dermoscopy images of six cases of early stage nail apparatus melanoma and 25 cases of benign longitudinal melanonychia were analyzed with our screening system and a threshold of melanoma discrimination index was determined. This single melanoma discrimination index diagnosed early nail apparatus melanoma with 100{\%} sensitivity and 92{\%} specificity. The automatically calculated index proposed in the present study is valuable for managing longitudinal melanonychia. The results suggest that the degree of color variegation is essentially different between early nail apparatus melanoma and benign longitudinal melanonychia including melanocytic nevus of the nail apparatus.",
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    T2 - Proposition of a discrimination index for detecting early nail apparatus melanoma

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    AU - Fujii, Jyuzo

    AU - Saida, Toshiaki

    AU - Sota, Takayuki

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    N2 - The prognosis of nail apparatus melanoma is generally poor because of difficulty in early stage diagnosis. Most nail apparatus melanomas occur as longitudinal melanonychia, and criteria and algorithms for dermoscopy diagnosis of longitudinal melanonychia have only recently been proposed. However, as with any clinical diagnosis, the diagnosis based on dermoscopy is to some extent subjective. Our goal is to develop an automated dermoscopic screening system for longitudinal melanonychia and to propose a novel objective and quantitative index for discriminating early nail apparatus melanoma from benign longitudinal melanonychia including melanocytic nevus. We propose an automatically calculated index representing degrees of color variegation in dermoscopic images of longitudinal melanonychia. Dermoscopy images of six cases of early stage nail apparatus melanoma and 25 cases of benign longitudinal melanonychia were analyzed with our screening system and a threshold of melanoma discrimination index was determined. This single melanoma discrimination index diagnosed early nail apparatus melanoma with 100% sensitivity and 92% specificity. The automatically calculated index proposed in the present study is valuable for managing longitudinal melanonychia. The results suggest that the degree of color variegation is essentially different between early nail apparatus melanoma and benign longitudinal melanonychia including melanocytic nevus of the nail apparatus.

    AB - The prognosis of nail apparatus melanoma is generally poor because of difficulty in early stage diagnosis. Most nail apparatus melanomas occur as longitudinal melanonychia, and criteria and algorithms for dermoscopy diagnosis of longitudinal melanonychia have only recently been proposed. However, as with any clinical diagnosis, the diagnosis based on dermoscopy is to some extent subjective. Our goal is to develop an automated dermoscopic screening system for longitudinal melanonychia and to propose a novel objective and quantitative index for discriminating early nail apparatus melanoma from benign longitudinal melanonychia including melanocytic nevus. We propose an automatically calculated index representing degrees of color variegation in dermoscopic images of longitudinal melanonychia. Dermoscopy images of six cases of early stage nail apparatus melanoma and 25 cases of benign longitudinal melanonychia were analyzed with our screening system and a threshold of melanoma discrimination index was determined. This single melanoma discrimination index diagnosed early nail apparatus melanoma with 100% sensitivity and 92% specificity. The automatically calculated index proposed in the present study is valuable for managing longitudinal melanonychia. The results suggest that the degree of color variegation is essentially different between early nail apparatus melanoma and benign longitudinal melanonychia including melanocytic nevus of the nail apparatus.

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