Thyroid Cancer describes all current diagnostic techniques, including FDG-PET and MRI. In recent years these modalities have documented hitherto hidden radioiodine-negative metastases, thus improving surgical therapy. The whole gamut of treatment, including surgery, radioiodine therapy, percutaneous radiation therapy and medical management, is covered. In some 10% of differentiated thyroid cancers, the well-known treatment tools of surgery and radioiodine therapy are not sufficient. New treatment modalities such as high-dose radioiodine therapy, redifferentiation therapy with retinoic acid and recombinant TSH are therefore highlighted. In a special section devoted to medullary thyroid cancer, new imaging procedures such as octreotide scintigraphy are described. The second edition includes two new chapters, on I-124 PET and dosimetry. Other chapters have been modified particularly in view of the new UICC classification, with special regard to the definition of T1 tumors.