Embolization of the meningohypophyseal trunk as a cause of diabetes insipidus

We present an unusual case of diabetes insipidus occurring after selective embolization of 50 % dextrose and pure ethanol into an enlarged left mening ohypophyseal trunk (MHT) supplying a dural carotid cavernous fistula. The i nferior hypophyseal artery was not opacified during the selective preemboli zation MHT injection; however, diabetes insipidus developed abruptly a few hours after the procedure. The patient required intranasal 1-deamino-(8-D-a rginine)-vasopressin for approximately 3 months, after which his symptoms r esolved. The hazards of using liquid embolic agents, especially ethanol, in the cavernous branches of the internal carotid artery should always be bor ne in mind.