Merkel cell carcinoma of the vulva: a case report.

The clinical and pathologic findings of Merkel cell carcinoma of the vulva were reported. The light microscopic findings of sheets of small, uniform cells were consistent with a diagnosis of neuroendocrine tumor. The electron microscopic characteristics revealed membrane-bound secretory granules, confirmed the diagnosis of Merkel cell carcinoma. Regional lymphnode metastases were present at the time of initial surgery and the adjunctive radiotherapy was also given. This case was unusual because Merkel cell carcinoma was usually found on the face, extremities and buttocks.