[A Case of Synchronous Papillary Thyroid Cancer and Breast Ductal Cancer].

Occurrences of thyroid cancer and breast cancer metachronously or synchronously are common for women. Explanations for these associations include detection bias, shared hormonal risk factors, and genetic susceptibility, but the etiology behind specific associations is not elucidated well. The importance of the relationship between breast and thyroid cancer will continue to become evident and physicians should be aware of this association in caring for thyroid and breast cancer survivors. We report a case of synchronous papillary thyroid cancer and breast ductal cancer.