ABSTRACT
Adjuvant EBRT is indicated for incompletely excised or inoperable WDTC (usually T4a or T4b) that does not concentrate iodine-131 sufficiently. The area of incomplete excision is usually in the thyroid bed but occasionally in the neck where there is extracapsular lymph node spread or invasion of local structures. Less well-differentiated follicular or papillary cancers (in particular Hürthle cell neoplasms) take up iodine poorly.
