US performed by a skilled operator is a reliable tool for adenoma localization prior to minimally invasive parathyroidectomy. If the US findings are inconclusive, a Tc-sestamibi scan should be used. If there is a high clinical suspicion of adenoma in the presence of negative imaging studies, bilateral neck exploration should be performed.

The treatment of choice for well-differentiated thyroid cancer in young patients is total thyroidectomy. Neither regional disease at presentation nor recurrences affect survival.

C-4.

The factors of age, tumor size, invasion of blood vessels, and distant metastases are significant predictors of survival for patients with follicular carcinoma, whereas sex is not; regional spread needs to be evaluated further.

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Hurthle cell carcinoma is a rare thyroid cancer histologically related to the well-differentiated malignancies of the thyroid gland. This report presents the evaluation of 30 years experience in treating 17 patients (out of 549 thyroid cancer patients) with Hurthle cell carcinoma. All 17 patients were treated surgically. Six patients (35.3%) died of their thyroid disease. Survival rates for 10 and 15 years were 63.7% and 25%, respectively. These rates are above those of high-grade malignancies and below those of low-grade malignancies of the thyroid gland. Nonsurgical treatment, including radioactive iodine therapy, is disappointing; thus, initial radical surgery is recommended as the treatment of choice.