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Merkel Cell Polyomavirus‒Negative Merkel Cell Carcinoma Originating from In Situ Squamous Cell Carcinoma: A Keratinocytic Tumor with Neuroendocrine Differentiation

Keratinocytic TumorTumoral PathologyEar MoldingSurgical PathologyPathologyNeuroendocrine DifferentiationDermatologyMedicineCancer-associated Virus