PET Scan in Thyroid Cancer.

摘要

Patients with differentiated thyroid carcinoma usually have a good prognosis; however, up to 40% of them may develop local recurrence. PET scanning has added new information on disease evaluation. The most appropriate indication to fluorodeoxyglucose (FDG) PET scan is in evaluating patients with high thyroglobulin level when I-131 radioiodine whole-body scans are negative and in patients with medullary thyroid carcinoma when the serum calcitonin level is increased. PET scan is also useful in detecting intrathyroid lesions harboring malignancy when FDG uptake in the thyroid is noted incidentally in patients undergoing PET for another indication.