Distant metastases from pathologically proven benign follicular nodules of the thyroid: clinicopathological features and predictors of long-term survival.

MI-FTC, FT-UMP, and WDT-UMP tended to be ignored and/or misdiagnosed as benign follicular lesions. Lack of monitoring of Tg changes after initial thyroidectomy and the presence of RR-DTC were identified as independent factors associated with poor survival.