Large, Slowly Growing, Benign Thyroid Nodules Frequently Coexist With Synchronous Thyroid Cancers.

The risk of synchronous, clinically important thyroid cancers is small, but not null in patients with large or slow growing thyroid nodules. Therefore, more precise preoperative evaluation is needed to separate the patients who would clearly benefit from thyroid surgery from the vast majority of those who do not need to be operated.