Abstract
Today, positron emission tomography (PET) investigation using fluorodeoxyglucose (FDG) is the most sensitive and specific single modality established for localizing metastases of medullary thyroid cancer (MTC). Even at calcitonin serum levels below 20 pg/ml, tumour localization may be successful in individual cases. However, especially in such early tumour stages, the morphological correlation using PET is unsatisfactory. With the newly available fixed combination of PET and computed tomography (PET/CT), this drawback can be overcome as PET/CT allows a point-by-point correlation of pathological function with morphological structure. Conventional PET alone yielded an approx 80 % sensitivity and specificity in MTC: a result that will be surpassed by the combined PET/CT scanner.
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