Early identification and diagnosis by type and stage is the key to high survival rates with thyroid cancer. To present the pathologist with current clinical information on diagnosis, differential diagnosis, staging, and prognosis of thyroid cancers, topics presented are: Poorly differentiated thyroid carcinoma; Paraganglimoa; Immunohistochemical markers for evaluation and prognosis in thyroid carcinoma; Familial endocrine syndromes; Parathyroid enoplasia; Inflammatory lesions of the thyroid associated with cancer; Assessing biological aggression in adrenal cortical neoplasia; Pituitary...