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Features of neuroendocrine-type mucinous sweat gland carcinoma (Case no. 63). A, High magnification, Periodic acid–Schiff (PAS) staining highlights intracellular and extracellular mucin. B, Low magnification, p63 staining reveals a loss of myoepithelial rim around invasive nodules, an accepted mark of invasion in carcinomas of the breast. The adjacent normal eccrine glands represent a positive control.
