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SBRT for re-irradiation
2
• A 50 year old female with a history of papillary thyroid cancer
• In 1979 was treated with Iodine-131
• followed by external beam radiotherapy consisting of 40Gy Photon
radiotherapy and 20Gy Electron radiotherapy
• Details of radiotherapy techniques and doses to organs-at-risk are
unknown
• Developed breast cancer in 2002 and bone metastases in 2007
• In 2008, a palliative radiotherapy of thoracic vertebras 2-4 was
performed with a total dose of 40Gy
o
20 Gy were delivered using posterior wedged fields
o
20 Gy were delivered using AP/PA fields with sparing of the spinal
cord
Case example: re-irradiation for verterbral
metastasis