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.