[Interruption of the lateral sinus in surgery of paraganglioma and acoustic neurinoma. Apropos of 2 complications].

The sigmoid sinus, one of the main structures of the venous cerebral circulation, may be interrupted by various pathological or surgical processes. Usually, interrupted circulation is compensated by collateral or contralateral venous circulation. No neurological deficit is observed. We report two neurological complications: cerebellar infarction and intracranial hypertension, secondary to lateral sinus interruption during removal of a paraganglioma and an acoustic neuroma. Attention is drawn on the importance of preoperative evaluation of the venous cerebral circulation to prevent such complications.