Abstract: Objective　To observe the morphological characteristics of tentorial sinus and bridging veins of tentorium using three-dimensional visualization technology based on CE-MRV, and to explore its clinical significance. 　Methods　Eighty patients who underwent 3D CE-MRV examination in our hospital from January 2016 to November 2019 were randomly selected, and a 3D reconstruction model of the tentorium-veins was established by the StealthViz program in the Stealth Station S7 neuronavigation system. The morphological characteristics of tentorial sinus and bridging veins of tentorium were analyzed.　Results  The tentorial sinus can be divided into a medial group, a middle group, and a lateral group. Their common confluence sites from more to less were the transverse sinus, torcular herophili, straight sinus, and superior petrosal sinus. The bridging veins from above the tentorium can be divided into single stem type, multiple stem type, candelabra type, and venous lakes type. Among them, the multiple stem type was the most common type. The cerebellar bridging veins below the tentorium can be divided into a tentorial group, a torcular herophili group, and a petrosal group. The distribution of the bridging vein joining the torcular?herophili was relatively concentrated. 　Conclusions　Three-dimensional visualization technology can effectively display the venous anatomy in the tentorium region of the cerebellum, help to understand the anatomy and drainage characteristics of the cerebral vein in the tentorium area, which is of guiding significance to the design of surgical approach and the protection of the adjacent bridging veins.

Key words: Tentorium cerebelli,  , Tentorial sinus, 　Bridging veins, 　3D CE-MRV, 　Three-dimensional visualization technology