Accidental subarachnoid hemorrhage due to undiscovered cerebral venous sinus thrombosis during cesarean section

Cerebral venous sinus thrombosis (CVST), a rare cerebrovascular event, occurs in approximately 5 out of 1,000,000 people. Because subarachnoid hemorrhage (SAH) due to CVST during emergency cesarean section is rare, this condition is difficult to recognize and diagnose in patients under anesthesia. This report describes a parturient who experienced severe headache and motor weakness during an emergency cesarean section. The first manifestation of CVST was a severe headache, which overlapped with the presentation of SAH, making early diagnosis verydifficult. Anesthesiologists should be aware of the risk of CVST in pregnant women and closely monitor those who experience slight changes in intraoperative neurological symptoms.