Thyroid vertebrates. In fish, it is usually located below the gills and is not always divided into distinct lobes. However, in some teleosts, patches of thyroid tissue are found elsewhere in the body, associated with the kidneys, spleen, heart, or eyes. In tetrapods, the thyroid is always found somewhere in the neck region. In most tetrapod species, there are two paired thyroid glands – that is, the right and left lobes are not joined together. However, there is only ever a single thyroid gland in most mammals, and the shape found in humans is common to many other species. In larval
Computed tomography of the thyroid done pre-operatively for anaplastic thyroid cancer and post-operatively for DTCs. DTC distant metastases sites include the lung (50 %), bone (25 %), lung and bone (20 %), followed by other sites (5 %). The thyroid cancer recurrence rate is reported to range from 7 % to 14 %. Recurrence is usually detected within the first decade after initial disease diagnosis. Large lymph node metastasis is considered the strongest predictor for thyroid cancer recurrence. Post-treatment surveillance for recurrent disease depends on cancer type and staging. Patients with DTC are usually treated with total thyroidectomy and RAI ablation. Patients should have baseline