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. 2013 Jul-Aug;88(4):646-8.
doi: 10.1590/abd1806-4841.20132058.

Parallel ridge pattern on dermoscopy: observation in non-melanoma cases

Tainá Scalfoni Fracaroli  1 , Fernanda Guedes Lavorato, Juan Piñeiro Maceira, Carlos Barcaui
Affiliations

Parallel ridge pattern on dermoscopy: observation in non-melanoma cases

Tainá Scalfoni Fracaroli et al. An Bras Dermatol. 2013 Jul-Aug.

Abstract
in English, Portuguese

The acral melanoma is the most prevalent type of melanoma in the non-Caucasian population, and dermoscopy is a useful tool for earlier diagnosis and differentiation from benign lesions. The dermoscopic pattern often associated with melanoma on the volar skin is the parallel ridge, with 99% specificity according to the literature. However, this pattern can also occur in several benign acral lesions, so it is important to make a good interpretation of this pattern, along with the clinical history and evolution.

O melanoma acral é o tipo mais prevalente de melanoma na população não caucasiana, sendo a dermatoscopia uma ferramenta útil para um diagnóstico mais precoce e diferenciação com lesões benignas. O padrão dermatoscópico, frequentemente, associado ao melanoma na pele volar é o de cristas paralelas, com 99% de especificidade segundo a literatura. No entanto, também pode ocorrer em diversas lesões acrais benignas, por isso é importante uma boa interpretação deste padrão, associado a história clínica e evolução.

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Conflict of interest statement

Conflict of interest: None

Figures

FIGURE 1
FIGURE 1
Racial melanosis on the plantar arch of a phototype V patient
FIGURE 2
FIGURE 2
Dermoscopy showing parallel ridge pattern and mottled pigmentation area sparing the acrosyringia aperture
FIGURE 3
FIGURE 3
Melanocytic nevus on the plantar region of a phototype IV patient, that also presented with a congenital giant nevus on the torso )
FIGURE 4
FIGURE 4
Parallel ridge dermoscopic pattern with preservation of the eccrine glands aperture and pigmentation on the furrows.
See this image and copyright information in PMC

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