Melanoma pattern and structures on special sites

From dermoscopedia

Main PageTwo-step algorithmMelanoma pattern and structures on special sites
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 Authored by: Ralph P. Braun     ·  Aimilios Lallas     ·  Ashfaq A. Marghoob

 Keywords:   melanoma · special locations · two-step algorithm
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Description This chapter describes the dermoscopyThe examination of [skin lesions] with a 'dermatoscope'. This traditionally consists of a magnifier (typically x10), a non-polarised light source, a transparent plate and a liquid medium between the instrument and the skin, and allows inspection of skin lesions unobstructed by skin surface reflections. Modern dermatoscopes dispense with the use of liquid medium and instead use polarised light to cancel out skin surface reflections. of melanomaThis glossary term has not yet been described. specific structuresThis glossary term has not yet been described. on special sites
Author(s) Ralph P. Braun · Aimilios Lallas · Ashfaq A. Marghoob
Responsible author Ash Marghoob→ send e-mail
Status released
Status update July 2, 2018
Status by Ralph P. Braun


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Volar: melanomas on the palmsThis glossary term has not yet been described. and solesThis glossary term has not yet been described.

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  • Parallel ridge patternVolar pigmentation forming lines, parallel, diffuse and irregular, along the ridges or cristae superficiales (raised portion of the dermatoglyphics)
  • Atypical fibrillar patternLinear pigmented filamentous lines of similar length with one end at the furrows and oriented at a certain angle to the furrows and crossing the ridges
  • Diffuse pigmentation with multiple shades of brown
  • Multi-component pattern

Faceis a central body region of sense and is also very central in the expression of emotion among humans and among numerous other species.

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  • Annular-granular patterndots gray and circles gray
  • Asymmetric follicular openings
  • Gray dotsDots are small, round structures of less than 0.1 mm in diameter that have a red color when corresponding to blood vessels; however, when due to melanin, their color ranges from black, brown, to blue-gray depending on the depth and concentration of the melanin in the skin (Tyndall effect)./granules around ostial openings
  • Circle within circle sign
  • Angulated lines forming rhomboidsGray-brown angulated lines forming a polygonal shape around adnexal ostial openings.
  • Blotches

Nails:

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The presence of melanin inclusions defines the lesion as melanocyticThis glossary term has not yet been described.. These lesions consist of melanocyte activation as seen in lentigo or melanocytic proliferation as seen in neviThis glossary term has not yet been described. and melanoma. While evaluating the nailThis glossary term has not yet been described. plate it is important not to overlook evaluating the paronychia (micro-Hutchinson’s sign) area and hyponychial skin (parallel ridge patternVolar pigmentation forming lines, parallel, diffuse and irregular, along the ridges or cristae superficiales (raised portion of the dermatoglyphics) will be seen).

  • Atypical bands
consisting of lines of different colorsThis glossary term has not yet been described. and thicknesses. The bands may lose their parallelism and appear to converge distally creating a triangular appearance to the band (wider at proximal end and narrow at the distal end)

Mucosa:

The features to define early mucosal melanoma have not yet been elucidated. Clearly any lesion with a multi-component pattern should be viewed with suspicion. In addition, any lesion manifesting the colors blue, gray or white should be view with concern for melanoma.