PMC4899644_01
The clinical, dermoscopic, and histopathological manifestations of BCC. a A black macule of 2 mm in diameter is observed on the left auricle (arrowhead). b Dermoscopic findings: multiple blue-gray ovoid nests and a whitish veil are observed, without arborizing vessels. c, d The tumor cells proliferate in a palisading pattern at the periphery, with basal melanosis. There are deposits of mucin and clefts in the surrounding area. The upper dermis shows the infiltration of inflammatory cells, mainly lymphocytes [HE; original magnification: x40 (c), x100 (d)].
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F1
A black macule of 2 mm in diameter was observed on the left auricle (fig. 1a, arrowhead). A dermoscopic examination revealed multiple blue-gray ovoid nests and whitish veils, but arborizing vessels were not found (fig. 1b). Deposits of mucin and clefts were observed in the surrounding area with dilated vessels in the papillary dermis (fig. 1c, d).
Clinical and histopathological manifestations of trichoblastoma. a A small black macule of 1 mm in diameter is observed on the left earlobe (arrowhead). b Dermoscopic findings: a round, homogeneous brownish structure is observed, without arborizing vessels. c The tumor cells proliferate in the dermis, with the cells being of multiple shapes, clear or basophilic and arranged in a partial palisading pattern (HE; original magnification: x40). d The tumor cells resemble a hair bulb surrounding fibrous stroma (HE; original magnification: x100).
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F2
A physical examination indicated the presence of a small black macule with a diameter of 1 mm on the left earlobe (fig. 2a, arrowhead). A dermoscopic examination revealed a round, homogeneous, brownish structure without arborizing vessels (fig. 2b). The tumor cells also resembled follicular germinative cells without keratinizing cysts, and islands of tumor cells were present as hair bulbs surrounding fibrous stroma (fig. 2c, d).