Abstract
Knowledge of parathyroid tumors is rather recent. Sandstrom suggested the hypothesis of their origin when he discovered the parathyroid gland in 1880. According to Berard and Alamartine, parathyroid tumors were for a long time difficult to distinguish from tumors of the thyroid gland, and many were diagnosed as fetal adenomas of Wolfler. Kocher, in 1899, described five cases of goiter containing glycogen and suggested that they might be parathyroid glands. In 1900, De Santi first described a parathyroid tumor in the carotid region. Some of the tumors did not cause symptoms during life and were discovered at necropsy. Small nodules were found in the usual parathyroid situation or deeply placed in the thyroid gland and encapsulated. It is known that parathyroid glands are found in various situations and that they might give rise to hyperplasia and even tumors, just as accessory thyroid glands and accessory breast tissue give rise to carcinoma.
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