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

1. Melgosa Ramos, F.J.
2. Revilla-Nebreda, D.
3. Revellés Peñas, L.
4. Rodríguez-Baeza, D.
5. Cañueto, J.
6. Santos-Briz, Á.