PMC6859035_01
Elevated well-circumscribed lesion which is irregularly shaped, reddish, and focally dark-brown
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On physical examination, the lesion was elevated, well-circumscribed, irregularly shaped, reddish, focally dark-brown, measuring 5 cm in maximum diameter (Figure 1).
Well defined nests of clear-looking or basaloid keratinocytes within an acanthotic epidermis (hematoxylin eosin x 100)
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Well defined nests of clear-looking or basaloid keratinocytes were present within the acanthotic epidermis, corresponding to the Borst-Jadassohn phenomenon (Figure 2).
Artifactual retraction spaces surrounding the clusters of tumor cells (hematoxylin eosin x 400)
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The tumor cells were small and monomorphic (Figure 3).