A pigmented flat lesion on the leg of a 72-year-old man
نویسندگان
چکیده
Dermoscopy disclosed a sharply demarcated lesion corresponding to the jelly-sign (red arrows). Additionally, multiple small and loosely arranged brown globules (blue circles) resembling the so-called dermoscopic “concentric structures,” were seen (Figure 2). A punch biopsy of the lesion was performed. Histopathological examination revealed multiple heavily pigmented intra-epidermal nests of basaloid cells, corresponding to the Borst-Jadassohn phenomenon (Figure 3, hematoxylin & eosin [H&E], x200).
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