MRI diagnosis of cerebral venous sinus thrombosis(analysis of 15 cases)

Objective:To investigate the diagnosic value of MRI for cerebral venous sinus thrombosis(VST).Methods:The complete clinical and imaging data were retrospectively analyzed in 15 cases proved VST.MRI were performed in all the 15 cases,in which Gd DTPA enhancement in 9 cases,cerebral venous MRA studies in 8 cases.CT were performed in 12 cases with 4 enhancement studies.Results:The superior sagittal sinus were affected in all the 15 cases,combined transverse sinus thrombosis in 11 cases,sinus confluence in 7 cases , sigmoid sinus in 6 case , inferior sagittal sinus,straight sinus were affected in 6 cases , cavernous sinus in 1 cases. The signal intensity of thrombus was heterogenous iso to hyperintense on T 1WI and different because of onset time on T 2WI,brain swelling,sulcus shallowing and gyrus blurring were also noted. 8 cases didn't have abnormal signal in brain tissue on T 2WI,whereas 7 cases did.Abnormal venous enhancement were found on contrast enhancement in all 9 cases.The signs of VST on MR venography included loss of vascular flow signal or a frayed appearance of the venous sinus.Theempty delta sign were found in 2 cases of all 12 CT studies , and atypical changes such as infarction ,hemorrhage were found in 4 cases.Conclusion:MRI is the first choice for diagnosis of VST,and has crucial significance for prognosis appraisal.