Cutaneous metastasis of mixed neuroendocrine, sarcomatous, and squamous rectal carcinoma mimicking a Merkel cell polyomavirus‐negative Merkel cell carcinoma.

Neuroendocrine (NE) tumors represent a heterogeneous group of neoplasms.[1] Merkel cell carcinoma (MCC) is an uncommon and highly aggressive primary cutaneous NE carcinoma, usually involving the head and neck of elderly patients. This tumor has a high percentage of lymph-node metastases (>60%) and a rate of distant metastases exceeding 40% but skin-located metastases are unusual. Cutaneous metastasis of mixed neuroendocrine, sarcomatous, and squamous rectal carcinoma mimicking a Merkel cell polyomavirus-negative Merkel cell carcinoma. [Extracted from the article]