Osteosarcoma of the Clavicle and Scapula Secondary To the Radiotheraphy for Servical Metastases of the Differentiated Thyroid Cancer: Case Report

A 67-year-old woman previously diagnosed with differentiated thyroid cancer (DTC) was transferred to our clinic with complaints of swelling, pain, stiffness of the left supraclaviculary region and left shoulder. She had undergone radiotheraphy for arc servical lymph node metastases fourteen years ago. Diagnostic I-131 whole body scan showed increased uptake in thyroid region without any uptake compatible with metastases. Three phase bone scan showed intense uptake within the expansive mass in the region of the left clavicle and left shoulder in all three phases. Histopathological revealed osteosarcoma of the left clavicle. Osteosarcoma of the clavicle and scapula following radiotherapy for DTC is rare condition. Diagnostic I-131 whole body scan and three phase bone scan are useful for diagnosis of radiation induced osteosarcoma in DTC patients.