Differentiated thyroid cancer following radioiodide 131I therapy of hyperthyroidism--a case report

Differentiated (papillary) thyroid cancer was detected 17 years following radioiodide 131I treatment for toxic multinodular goiter. 21 cases of thyroid cancers with previous 131 I therapy for hyperthyroidism were summarised. This combination is rare compared to the incidence of thyroid cancers following external irradiation. This may be due to higher absorbed dose to thyroid in 131I treatment.