Fissures and ridges

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 Author(s): Ralph P. Braun, Katrin Kerl
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Author(s) Ralph P. Braun · Katrin Kerl
Responsible author Ralph Braun→ send e-mail
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Status update May 29, 2017
Status by Ralph P. Braun

Fissures (invaginations or sulci) are commonly seen in seborrheic keratosis and may also be seen in melanocytic nevi with congenital pattern. In essence, fissures are linear grooves in the epidermis and, like comedo-like openings, correspond to surface invaginations. A pattern that resembles “brain-like appearance” or cerebriform appearance is created, with the grooves resembling “sulci” and the intervening ridges resembling surface“gyri” [1]. Fissures correspond histopathologically to wedgeshaped, keratin-filled invaginations of the epidermis [2].

Milia like cysts comedo like openings schematic new.jpg
Fissures and Ridges.JPG

  1. Kittler et al.: Standardization of terminology in dermoscopy/dermatoscopy: Results of the third consensus conference of the International Society of Dermoscopy. J. Am. Acad. Dermatol. 2016;74:1093-106. PMID: 26896294. DOI.
  2. Minagawa: Dermoscopy-pathology relationship in seborrheic keratosis. J. Dermatol. 2017;44:518-524. PMID: 28447350. DOI.
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