Intraoperative monitoring of the intrasinal pressure in the sigmoid sinus during a resection of the sigmoid sinus due to a large meningioma: The findings in two cases

Abstract

We report 2 cases involving the resection of the sigmoid sinus due to a large petroclival meningioma in which the intrasinal pressure of the sigmoid sinus was monitored during the course of the operation, in both cases the intrasinal pressure did not markedly increase after clamping of the sigmoid sinus. However, the intrasinal pressure did iucrease in one case due to an increase in the intratracheal pressure but did not increase in the other case. In the case that showed no increase in the intrasinal pressure, a trans sigmoid approach had been used for the operation. Further, no complications occurred in this case after the resection of the sigmoid sinus. This finding suggests that there may be various routings that enable venous drainage to occur during surgery, even in cases that do not show a remarkable increase in the intrasinal pressure after clamping of the sigmoid sinus.