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directly related with intracerebral hemorrhage in dural arteriovenous fistula (DAVF) because the cortical vein anatomically exists in the subarachnoid space [1]. Hemorrhage is the most serious event in cranial DAVF. Cortical venous reflux (CVR) has been known as a prognostic risk factor for hemorrhage in cranial DAVF [2]. Hemorrhage risk is related to lesion location, sex and cortical venous reflux [3]. Venous drainage pattern, especially the presence of cortical venous reflux, is a significant factor predicting intracranial hemorrhage from DAVF [4]. Annual hemorrhage rate of cranial DAVF is about 5% when there is cortical venous reflux. However, terminology of CVR is not exactly defined because meningeal venous reflux is also used in some literature [5]. At this present, there is a need of exact anatomical discrimination between cortical and pial venous refluxes (PVR) [1]. Veins were def ined as “cortical” when they coursed along the cortical surface draining into the venous sinus and as “pial” when the fine and tortuous veins were within the brain or on the brain surface under the pial membrane. Presence of PVR was also decided by comparison with cortical veins in the venous phase of the ipsilateral internal carotid arteriogram. Compared with cortical veins, which are regarded as the main leptomeningeal veins draining into sinus, the fine pial veins or the intracortical veins beneath the pial membrane were regarded as having a corkscrew-like appearance or intraparenchymal course, which cannot be seen on a routine normal angiogram [1, 7]. Cavernous sinus dural arteriovenous f istula (CSDAVF) which seems to occur more commonly in Korea is different in several aspects from DAVF involving other dural sinuses [8]. Anatomically, the cavernous sinus is an extradurally located sinus, whereas other dural sinuses are located between two dural walls in the cranial cavity. In addition, the clinical presentations are known to be benign because cavernous sinus has sufficient venous drainage routes; these include the superior ophthalmic vein, inferior and superior petrosal sinuses, superf icial middle cerebral vein, and the coronary sinus to the opposite side of cavernous sinus. Therefore, cortical and pial venous refluxes from the cavernous sinus seem to be less often compared to other type of lesion. Thus, CSDAVF which presents with various symptoms patterns and may have different pathophysiology and requires diverse treatment strategies [8-10]. It is also interesting to note that higher prevalence of diabetes mellitus was found in more aggressive type of DAVF. In addition, patients with aggressive symptoms had a higher prevalence of diabetes mellitus [11]. Brain edema and hemorrhage were the similarly associated with pial venous reflux since the concept of

Cortical versus Pial Venous Drainage in Dural Arteriovenous Fistula