[Primary cutaneous neuroendocrine carcinoma (Merkel tumor). Clinical and therapeutic update apropos of 4 cases].

The clinical and pathological features of 4 cases of cutaneous neuroendocrine carcinoma are reported. There are unusual malignancies mostly observed in elderly, the prognosis is poor by loco-regional aggressivity and disseminated metastases. They are diagnosed by a pathologist: ultrastructural studies and immunohistochemistry support the diagnosis. A combination of a wild local excision, node dissection and post-operative radiation is recommended.