Multiple pigmented trichoblastomas and syringocystadenoma papilliferum in naevus sebaceous mimicking a malignant melanoma: a clinical dermoscopic-pathological case study

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Abstract
We report a case of three distinct adnexal neoplasms associated with a naevus sebaceous of the scalp: a nodular pigmented trichoblastoma, a smaller flat pigmented trichoblastoma and a syringocystadenoma papilliferum, and discuss the clinical and histological features of these neoplasms. The clinical manifestation was suggestive of malignant melanoma, a feature that has never been reported before. For the first time in the literature we describe the case also by means of a noninvasive analysis, i.e. epiluminescence microscopy. In our experience, epiluminescence microscopy does not appear to be more diagnostically accurate than simple clinical examination when diagnosing lesions of the scalp, contrary to other regions.

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