Fissures and ridges
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” . Fissures correspond histopathologically to wedgeshaped, keratin-filled invaginations of the epidermis .
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