Pigmented eccrine poroma mimicking a pigmented basal cell carcinoma

Abstract

A 38 years old man presented a Black nodule on the face, which appears since childhood and was growing up 02 months before the consultation. It was painless and without pruritus. The dermatological examination showed a sessile-based nodule flesh-colored in places and black in others it was localized under the lower left eyelid. Dermoscopy showed typical ovoid nests and thick arborizing vessels. In front of this clinico dermoscopic panel, pigmented basal cell carcinoma was evoked. Histologic examination showed a proliferation of tumors connected to the epidermis, arranged in masse and made of regular cuboid cells presenting monomorphic nuclei with fine finely nucleated chromatin and an abundant basophilic cytoplasm. Massifs and spans are sometimes centered on cavities filled with eosinophilic material. The tumor cells are pigmented and the mitoses were rare (Figure 1–3).