Radiation-associated malignant fibrous histiocytoma of the oropharynx

Malignant fibrous histiocytoma is a rare sarcoma. This is the report of a r adiation-induced histiocytoma of the right tonsillar region. Because of squ amous cell carcinoma of the left tonsil, a 64-year-old woman was treated wi th primary surgery and postoperative radiotherapy. Six years later,a histiocytoma was diagnosed histologically within the form er field of radiation. This second primary tumor was resected radically. Cl inical, radiological, and histological findings are presented, and the impo rtance of this very rare malignant tumor, especially when it is radiation-i nduced, is discussed.