Prospective study of venou variation on venous phase of cerebral angiography of perimesencephalic nonaneurysmal subarachnoid hemorrhage (PNSH)

Abstract

Objective To analyze the venous phase of cerebral angiography of perimesencephalic nonaneurysmal subarachnoid hemorrhage (PNSH),compare the anatomic variants of deep cerebral venous drainage between aneurysmal subarachoid hemorrhage (ASAH) and PNSH and find out the different type of anatomic variants of deep cerebral venous drainage.Methods The PNSH cases were prospectively selected from June 1,2009 to June 1,2011.The patients were performed cerebral angiography and were defined as PNSH group.40 patients from our ASAH database in the same period were defined as control group.The venous phases of cerebral angiography of the PNSH group and control group were studied to find out theanatomic variants of deep cerebral venous drainage.Results Three different types of deep cerebral venous drainage ( type Ⅰ Ⅱ Ⅲ ) were found.There was statistically significant difference between the proportions of two groups ( x2 =21.73 P ＜ 0.05 ).Conclusions In patients with PNSH,deep cerebral venous drainage is more commonly seen directly into dural sinuses instead of via the vein of Galen compared with patients with ASAH.The type Ⅱ and Ⅲ drainage are more commonly seen in PNSH patients.Oppositely,the common deep cerebral venous drainage type in ASAH patients is typel.Because of the slight clinical symptoms,unlikely to reoccurrence and the negative results of cerebral angiography,the anatomic variants of deep cerebral venous drainage are contributed to PNSH. Key words: Perimesencephalic cistern; Subarachnoid hemorrhage; Nonaneurysmal hemorrhage; Cerebral angiography; Venous variant