Abstract: Objective　To explore the incidence of falcine sinus in the patients with parasagittal meningioma (PSM) and its iconographical characteristics of magnetic resonance venography (MRV), which providing protection for intraoperative venous protection.　Methods　MRV data of 42 PSM patients were retrospectively analyzed and were observed the incidence of persistent falcine sinus and recanalized falcine sinus. Then the relationship of falcine sinus with the stenosis degree of the superior sagittal sinus (SSS) and its MRV imaging features were collected.　Results　In total 42 patients, 6 patients had falcine sinus. Three of them were persistent falcine sinus. In addition, three of them were recanalized falcine sinus. The recanalized falcine sinus showed a non-uniform high signal band with ununiform size, flake and blurred boundary on MRV, the range was larger than that of persistent sickle sinus, but its signal intensity was low. There were statistical difference between the incidence of recanalized falcine sinus and the occlusion degree of SSS (P=0.007). The incidence rate of recanalized falcine sinus occurring in meningioma in posterior 1/3 segment was 37.5%.　Conclusions　 Facline sinus is common in PSM, and its MRV manifestations are characteristic. In meningiomas invading the SSS, especially with complete posterior SSS occlusion, the falcine sinus should be evaluated preoperatively to avoid iatrogenic injury.

Key words: Superior sagittal sinus, 　Meningioma, 　Falcine sinus, 　Magnetic resonance venography