Embolization of dural arteriovenous fistula during twin pregnancy - A case report and literature review

Background Several literature reviews have suggested that pregnancy may trigger the formation of dural arteriovenous fistulae (DAVF). However, few case reports have described DAVF discovered during pregnancy, and treatment strategies remain largely unknown. Case description: A 28-year-old primigravid woman without any medical history of note presented to our hospital for natural twin conception. She started to feel left-sided pulsatile tinnitus in 23 weeks of gestation. Magnetic resonance imaging of the head raised suspicion of left cavernous sinus DAVF with leptomeningeal venous drainage. Considering the risk of intracerebral hemorrhage due to the increased cardiac output in the third trimester of a twin pregnancy, we performed transarterial embolization for the DAVF, which was successfully achieved without complications in 28 weeks of gestation. Tinnitus resolved immediately after the procedure, and the postoperative course proved uneventful. Both fetuses were safely delivered by cesarean section on 37 1/7 weeks of gestation. Conclusions We encountered a case of cavernous sinus DAVF during a twin pregnancy. This case suggests that hemodynamic shift due to pregnancy has potential to cause higher shunt flow in an arteriovenous fistula. The timing of treatment should be determined in consideration of the hemodynamic change in the course of pregnancy. If X-ray exposures and iodine contrast media are appropriately managed, endovascular intervention is one treatment option, even during pregnancy.