CT changes in the septum pellucidum associated with intraventricular craniopharyngiomas

Although intraventricular craniopharyngiomas are usually located within the suprasellar cistern, they may arise from the floor of the third ventricle or lamina terminalis. Four cases of intraventricular craniopharyngioma are presented in which the CT findings included thickening or separation of the leaves of the septum pellucidum. The importance of this CT finding and its possible etiologies are discussed.