Farnaz Amouzegar-Hashemi - Department of Radiation-Oncology, Cancer Institute, Tehran University of Medical Sciences, Tehran, Iran
Peiman Haddad - Department of Radiation-Oncology, Cancer Institute, Tehran University of Medical Sciences, Tehran, Iran
Seyed Morteza Sajjadi - Department of Radiation-Oncology, Cancer Institute, Tehran University of Medical Sciences, Tehran, Iran

A retrospective study was undertaken to examine the thyroid cancer cases referred for external radiotherapy to our department during the period of ۱۹۹۱-۹۹. Within this period, a total of ۳۳ patients had been treated by irradiation for thyroid cancer or its metastases and these cases were evaluated for age, sex, pathology and type of surgery. The reason of patients’ referral for external radiotherapy (The main aim of our study) was tumor extensive infiltration of the neck soft tissue and/or lymph nodes in ۲۱ cases (۶۴%), and tumor metastasis in ۱۲ cases (۳۶%). Twenty-one patients came back for follow-up, who were all symptom-free ۱۲-۱۸ months after irradiation.