Regionally Metastatic Merkel Cell Carcinoma Associated with Paraneoplastic Anti-N-methyl-D-aspartate Receptor Encephalitis

Figure 2

(a) Magnification 400x, hematoxylin and eosin stain of the left neck; Merkel cell carcinoma primary tumor demonstrates numerous mitoses and neuroendocrine nuclei. (b) Magnification 200x, MCC left neck primary highlighting lymphovascular invasion. (c) Magnification 400x, immunohistochemistry demonstrates perinuclear dot-like immunostaining positive for cytokeratin 20. (d) Magnification 40x, MCC primary tumor of the left neck in subcutaneous tissue.

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