[A case report of epithelioid hemangioendothelioma metastasizing to the tonsil].

Epithelioid hemangioendothelioma is an extremely rare, difficult-to-diagnose vascular tumor mainly originating from the lung or liver. Primary tumors in the head and neck are very rare. A 40-year-old man admitted for right throat pain had been found in biopsy elsewhere to have squamous cell carcinoma. Based on a diagnosis of mesopharyngeal cancer, he underwent radical surgery, reporting cough, sputum, and hemosputum postoperatively. Epithelioid hemangioendothelioma was first diagnosed histopathologically from a biopsy of scalp tumors. Lung specimens at open biopsy 4 years earlier showed the same histological features indicating he had had epithelioid hemangioendothelioma lesion since that time. We assumed this epithelioid hemangioendothelioma had originated in the lung and metastasized to the right tonsil. These tumors are typically progressive and aggressive, and this patient had a poor prognosis. We discuss tumor features and review them clinically and histologically.