|Description||This chapter describes the dermoscopyDermoscopy is a non invasive diagnostic method. criteriameasure of how well one variable or set of variables predicts an outcome of melanocyticThis glossary term has not yet been described. lesions in acralAcral melanoma is a type of skin cancer that occurs on fingers, palms, soles, and nail beds. sites.|
|Author(s)||Ralph P. Braun · Luc Thomas|
|Owner||Ralph Braun → send e-mail|
|Status update||June 25, 2017|
|Status by||Ralph P. Braun|
- 1 Anatomy of palms and soles
- 2 Benign dermoscopy pattern 
- 3 Malignant dermoscopy pattern
- 4 BRAAFF Algorithm:
Acral, Melanoma, Acro-lentiginous melanoma, Parallel ridge pattern, Palms, Soles, Parallel furrow pattern, Diffuse pigmentation of variable shades of grey, Fibrillar pattern, Multicomponent pattern Acrolentiginous Melanoma (message) Acrolentiginous Melanoma – participate!
Anatomy of palmsThis glossary term has not yet been described. and solesThis glossary term has not yet been described.
The unique appearance of the skin on palms and soles is due to the presence of alternating furrows and ridges, which are responsible for creating our individualized dermatoglyphic patterns (fingerprints) The location of pigment in relationship to the furrows and ridges can help in differentiating benignis any condition that is harmless in the long run neviThis glossary term has not yet been described. from melanomaThis glossary term has not yet been described.. DermoscopyDermoscopy is a non invasive diagnostic method. helps more precisely localize the pigment and has been shownmto significantly improve the observer’s diagnostic accuracy when evaluating volar melanocytic tumors. Numerous specific dermoscopic patterns have been defined for nevi and melanoma located on acral sites. In benign melanocytic tumors, the location of the pigment tends to favor the crista limitans, which corresponds to the furrows of the skinThis glossary term has not yet been described.. Recentresearch has revealed that acral nevi may be located at he tips of rete ridgeThis glossary term has not yet been described. sassociated with the crista intermedia and limitans; however, they preferentially transfer melanin to the keratinocytes associated with the furrow. In melanoma the malignantThis glossary term has not yet been described. melanocytes tend to cluster around the crista intermedia, which in turn often results in pigment located on the ridges. Lesions on volar skin that manifest any of the melanoma-specific structures (malignant patterns).
Parallel furrow patternVolar pigmentation forming solid or dotted lines, parallel, thin, on the furrows (sulci superficiales or invaginations in dermatoglyphics). The lines are occasionally doubled, each line is beside the furrows.
Linear pigmentation, predominantly localized to the furrows. The ridges are relatively hypopigmented.
Lattice-like patternVolar pigmentation forming thin lines, parallel on the furrow or sulci superficialis (invaginations in dermatoglyphics) and crossing perpendicular on the ridges
Similar to the parallel furrow patternVolar pigmentation forming solid or dotted lines, parallel, thin, on the furrows (sulci superficiales or invaginations in dermatoglyphics). The lines are occasionally doubled, each line is beside the furrows. with the addition of parallel pigment bands that cross over the ridges from one furrow to the next.Pattern can chow some 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).
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
Dense fibrillar pigmentation composed of multiple thin parallel lines that cross both the furrows and ridges; the lines have a transverse orientation in relation to the furrows and ridges
Parallel ridge patternVolar pigmentation forming lines, parallel, diffuse and irregular, along the ridges or cristae superficiales (raised portion of the dermatoglyphics)
Linear pigmentation of the ridges. The furrows are relatively hypopogmented.
Diffuse pigmentation of variable shades of brown
Diffuse pigmentation of different shades of brown colorColor (American English) or colour (Commonwealth English) is the characteristic of human visual perception described through color categories, with names such as red, yellow, purple, or blue. not respecting furrows or ridges.
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
A fibrillar pattern that is very heterogeneous, that is asscociated with another malignant pattern, or that is not located on the areas of the foot bearing the body pressure is called atypical fibrillar pattern. This should be considered with precaution.
Milky red areasMilky-white appearance or pinkish structureless areas ("strawberry and ice cream"-like), consisting a red vascular blush with no specific distinguishable vessels
Presence of reddish whitish colors. This is mainly seen in thick tumors when there is a nodular component which is vascularized. Most of the time this part is raised or even nodular and and associated with a multicomponent pattern.
BRAAFF AlgorithmIn mathematics and computer science, an algorithm (Listeni/ˈælɡərɪðəm/ AL-gə-ri-dhəm) is a self-contained sequence of actions to be performed. Algorithms can perform calculation, data processing and automated reasoning tasks.:
This alrogithm has been proposed recently by Lallas et al. 
B Irregular Blotch +1
R Parallel Ridge Pattern +3
A Asymmetry of Structures +1
A Asymetry of colors +1
F Parallel Furrow Pattern -1
F Fibrillar Pattern -1
1 pointThis glossary term has not yet been described. is required to make the diagnosisis the identification of the nature and cause of a certain phenomenon. Diagnosis is used in many different disciplines with variations in the use of logic, analytics, and experience to determine "cause and effect". In systems engineering and computer science, it is typically used to determine the causes of symptoms, mitigations, and solutions of melanoma.
- Braun et al.: Dermoscopy of acral melanoma: a multicenter study on behalf of the international dermoscopy society. Dermatology (Basel) 2013;227:373-80. PMID: 24296632. DOI.
- Phan et al.: Dermoscopic features of acral lentiginous melanoma in a large series of 110 cases in a white population. Br. J. Dermatol. 2010;162:765-71. PMID: 19922528. DOI.
- Lallas et al.: The BRAAFF checklist: a new dermoscopic algorithm for diagnosing acral melanoma. Br. J. Dermatol. 2015;173:1041-9. PMID: 26211689. DOI.