Pituitary craniopharyngioma with tooth formation

A classic pituitary craniopharyngioma was removed from the suprasellar and intrasellar regions of a 4‐year‐old boy. In each of 2 separate surgical specimens, a rudimentary tooth was found buried within the tumor. The implication of this finding in characterizing the embryology of the development of the tooth and pituitary is discussed. It is concluded that this tumor arose from tissue which, by the production of a tooth, expressed its fullest capacity of differentiation, and that the craniopharyngioma is developmentally related to the adamantinoma of the jaw.