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Most commonly, however, especially in children, infection of the thyroid gland is a result of direct extension from an internal fistula from the pyriform sinus [4, 6, 7, 49, 69-71].This tract is thought to represent the course of migration of the ultimo branchial body from the site of its embryonic origin in the fifth pharyngeal pouch [].Careful histopathological studies of these fistulae have ... ................
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