Osteosarcoma of the mastoid process following radiation therapy of mucoepidermoid carcinoma of the parotid gland--a case report.

Radiation therapy is frequently used method in treatment of the head and neck malignancies. Osteosarcoma is a rare complication of radiation therapy and usually occurs after a long latent period. We report the case of 75-year-old female with osteosarcoma of the mastoid process.