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 with controversial management guidelines. Wilhelm et al. followed 41 patients with a known extra-thyroid malignancy and ITNs; 35 of them met the criterion for biopsy (nodule ≥ 1 cm). Pathology revealed four papillary thyroid cancers and five micropapillary thyroid cancers. Only two metastatic cancers were detected. Clinical history (history of radiation, age, endocrine syndromes), TSH, nodule size, and sonographic features are important to determine which nodule(s) should be followed or biopsied. However, existing guidelines do not specifically address how to approach ITNs detected on CT scans in such a specific patient population. Thyroid lymphoma represents about 5 % of thyroid