Fig. 1From: Non-contrast CT image characteristics on admission predict the 3-month outcome of cerebral venous sinus thrombosis: an observational study in a single institutionCT image-based classification and grading system: I no obvious abnormality (grade I); II simple vein infarction without hemorrhage (grade II); III cerebral venous infarction with subarachnoid hemorrhage (grade III); IV cerebral vein infarction with hematoma (grade IV)Back to article page