To evaluate the prevalence, 15-year cumulative incidence, time interval, and prognosis of radiation-induced malignant fibrous histiocytoma of the head and neck in long-term survivors of nasopharyngeal carcinoma.
Tertiary care hospital.
Eight long-term survivors of nasopharyngeal carcinoma with malignant fibrous histiocytoma in the maxillary sinus or nasal cavity.
Main Outcome Measurement:
Survival of postirradiation malignant fibrous histiocytoma in patients with nasopharyngeal carcinoma.
The prevalence of radiation-induced malignant fibrous histiocytoma in long-term survivors of nasopharyngeal carcinoma was 0.38%. The 15-year cumulative incidence was 2.2%. Most tumors occurred in the maxillary sinus and were characterized by spindleshaped tumor cells with plump nuclei arranged in a whorl or storiform pattern in a fibrous stroma. The mean interval between malignant fibrous histiocytoma and nasopharyngeal carcinoma was 121 months. Local recurrence developed in all cases within 9 months after surgery. Six patients died of disease without distant metastasis within 30 months. Two patients were alive with disease for 10 and 32 months, respectively.
Radiation-induced malignant fibrous histiocytoma in the head and neck region in long-term survivors of nasopharyngeal carcinoma is rare. It takes a long time to occur after irradiation and is locally invasive with poor prognosis.(Arch Otolaryngol Head Neck Surg. 1996;122:535-538)
Ko J, Chen C, Tak Lui L, Hsu M. Radiation-Induced Malignant Fibrous Histiocytoma in Patients With Nasopharyngeal Carcinoma. Arch Otolaryngol Head Neck Surg. 1996;122(5):535–538. doi:10.1001/archotol.1996.01890170067013
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