
doi: 10.1111/cup.12694
pmid: 26956243
Desmoplastic trichilemmoma (DT), the pseudomalignant variant of conventional trichilemmoma described by Hunt et al in 1990, displays a superficial lobular growth pattern of glycogen‐rich cells with peripheral nuclear palisading surrounded by a thickened basement membrane. DT differs from its conventional counterpart by showing a central hyalinized area with epithelial cords and strands mimicking invasive carcinoma. We report a case that fully satisfies the criteria for DT and, in addition, shows an extensive melanocytic cell component and prominent melanin deposition. To our knowledge, a pigmented variant of DT has not been reported and should be recognized in order to appropriately face the differential diagnosis with malignant pigmented tumors particularly pigmented basal cell carcinoma (BCC).
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