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Assessment of the colors of melanin pigment in acral compound nevus by using a novel dermoscopy technique with surgical light illumination and saturation analysis.

Sakai H, Tonomura K, Shirabe H, Tanaka M - Dermatol Pract Concept (2014)

View Article: PubMed Central - PubMed

Affiliation: Department of Dermatology, NTT West Japan Osaka Hospital, Osaka, Japan.

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On dermoscopy, the amount and location of melanin pigment can be assessed on the basis of its colors, ranging from black, brown to blue-gray... In dermoscopy, it is established that the color of melanin pigment varies black in the stratum corneum, black to brown in the epidermis, brown to blue-gray at the dermoepidermal junction, to blue-gray in the dermis... In addition, in acral nevi in the presented cases, (iii) saturated melanin may vary in color from black to brown depending on the amount of melanin (Figure 12)... On the basis of the report showing that dermoscopic patterns of acral nevi are thought to reflect melanin distribution in the stratum corneum, most of the saturated melanin may reflect the melanin granules in the stratum corneum... On the basis on the report showing that the histological pattern of melanin distribution in the stratum corneum is key to discriminating early acral melanoma from acral nevus, the dermoscopic pattern of saturated melanin may provide clues to discriminating early acral melanoma from acral nevus... On the other hand, change in colors to blue, related to the depth of melanin have been explained by the Tyndall effect in which short-wavelength visible light (blue) is dispersed and reflected more than long-wavelength light (red)... However, in the presented cases, color changes to blue did not occur... The primary parameter related to the depth of melanin pigment is saturation... In conclusion, depth assessment of melanin pigment by using saturation analysis is a new and important concept... Saturation analysis can be applicable for evaluating the images of various pigmented skin lesions... Especially, the images from a non-contact polarized dermoscope might have superior saturation reproducibility of the deep skin structures... Saturation analysis and three-dimensional construction are easy-to-use and useful techniques for all dermatologists.

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White represents maximum saturation (colorful), and black represents minimum saturation (grayish). Unsaturated melanin pigments were present on the ridges, and saturated melanin pigments were present on the furrows. (Copyright: ©2014 Sakai et al.)
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f6-dp0404a09: White represents maximum saturation (colorful), and black represents minimum saturation (grayish). Unsaturated melanin pigments were present on the ridges, and saturated melanin pigments were present on the furrows. (Copyright: ©2014 Sakai et al.)

Mentions: First, on the basis of the hue-saturation-lightness (HSL) color model, we decomposed the dermoscopic image into three grayscale images, the hue image, saturation image and lightness image, by using GIMP2 [1] (Figure 5). In the gray-scale saturation image, in which white represents maximum saturation (colorful) and black represents minimum saturation (grayish), unsaturated melanin pigments were observed on the ridges, and saturated melanin pigments were on the furrows (Figure 6). Note that the parallel furrow pattern due to saturated melanin was more sensitive and fine than the original pattern.


Assessment of the colors of melanin pigment in acral compound nevus by using a novel dermoscopy technique with surgical light illumination and saturation analysis.

Sakai H, Tonomura K, Shirabe H, Tanaka M - Dermatol Pract Concept (2014)

White represents maximum saturation (colorful), and black represents minimum saturation (grayish). Unsaturated melanin pigments were present on the ridges, and saturated melanin pigments were present on the furrows. (Copyright: ©2014 Sakai et al.)
© Copyright Policy
Related In: Results  -  Collection

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getmorefigures.php?uid=PMC4230259&req=5

f6-dp0404a09: White represents maximum saturation (colorful), and black represents minimum saturation (grayish). Unsaturated melanin pigments were present on the ridges, and saturated melanin pigments were present on the furrows. (Copyright: ©2014 Sakai et al.)
Mentions: First, on the basis of the hue-saturation-lightness (HSL) color model, we decomposed the dermoscopic image into three grayscale images, the hue image, saturation image and lightness image, by using GIMP2 [1] (Figure 5). In the gray-scale saturation image, in which white represents maximum saturation (colorful) and black represents minimum saturation (grayish), unsaturated melanin pigments were observed on the ridges, and saturated melanin pigments were on the furrows (Figure 6). Note that the parallel furrow pattern due to saturated melanin was more sensitive and fine than the original pattern.

View Article: PubMed Central - PubMed

Affiliation: Department of Dermatology, NTT West Japan Osaka Hospital, Osaka, Japan.

AUTOMATICALLY GENERATED EXCERPT
Please rate it.

On dermoscopy, the amount and location of melanin pigment can be assessed on the basis of its colors, ranging from black, brown to blue-gray... In dermoscopy, it is established that the color of melanin pigment varies black in the stratum corneum, black to brown in the epidermis, brown to blue-gray at the dermoepidermal junction, to blue-gray in the dermis... In addition, in acral nevi in the presented cases, (iii) saturated melanin may vary in color from black to brown depending on the amount of melanin (Figure 12)... On the basis of the report showing that dermoscopic patterns of acral nevi are thought to reflect melanin distribution in the stratum corneum, most of the saturated melanin may reflect the melanin granules in the stratum corneum... On the basis on the report showing that the histological pattern of melanin distribution in the stratum corneum is key to discriminating early acral melanoma from acral nevus, the dermoscopic pattern of saturated melanin may provide clues to discriminating early acral melanoma from acral nevus... On the other hand, change in colors to blue, related to the depth of melanin have been explained by the Tyndall effect in which short-wavelength visible light (blue) is dispersed and reflected more than long-wavelength light (red)... However, in the presented cases, color changes to blue did not occur... The primary parameter related to the depth of melanin pigment is saturation... In conclusion, depth assessment of melanin pigment by using saturation analysis is a new and important concept... Saturation analysis can be applicable for evaluating the images of various pigmented skin lesions... Especially, the images from a non-contact polarized dermoscope might have superior saturation reproducibility of the deep skin structures... Saturation analysis and three-dimensional construction are easy-to-use and useful techniques for all dermatologists.

No MeSH data available.