Abstract
THIS presentation is based on a clinical analysis of 43 patients with thyroglossal cysts and sinuses that were admitted to the Manhattan Eye, Ear and Throat Hospital in a ten year period, from 1931 to 1940 inclusive. These cysts and sinuses are of interest not only because they are of embryologic origin but also because in many instances they are confused with other conditions and treated incorrectly before they are recognized. For the correct diagnosis and treatment, a working knowledge of the embryology of the thyroid gland is necessary because these cysts and sinuses are due to a congenital disturbance of the development of this gland. NORMAL DEVELOPMENT OF THE THYROID GLAND Early in fetal life the anlage of thyroid gland arises as an evagination in the ventral wall of the primitive pharynx, between the first and second pharyngeal pouches. In adult life this position corresponds to the foramen cecum

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