PMC6489059_01
a Brownish macule with a bluish center on the dorsum of the right foot. b Dermoscopy showing a blue-steel pigmentation in one part and a violaceous color in the other, with hypopigmented areas. c Histology showing dermal proliferation of spindle cells organized in fascicles with a storiform pattern or in nests. H&E. Original magnification, x10. d Melan-A was diffusely positive. Immunohistochemistry. Original magnification, x5.
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F1
Clinical examination revealed a brownish macule with a bluish center that was slightly infiltrated (Fig. 1a). Dermoscopy showed a blue-steel pigmentation in one part and a violaceous color in the other, with hypopigmented areas (Fig. 1b). Based on the morphological aspect (Fig. 1a-c) and immunohistochemical profile (Fig. 1d), the diagnosis of atypical blue nevus (BN) with hypercellularity was made.