The value of CT and MRI in the detection of cerebral arachnoid granulations / 中国脑血管病杂志

ABSTRACT

Objective: To evaluate the diagnostic utility of CT and MRI in the detection of arachnoid granulations located in cerebral venous sinuses. Methods: MRI were applied in 8 patients for detection of arachnoid granulations, 7 of them also underwent CT scan. All of the images were analyzed retrospectively. Results: There were 9 arachnoid granulations found in the 8 patients. 6 of them were located in transverse sinus while 3 in superior sagittal sinus. 7 arachnoid granulations were manifested low density in CT, 3 of them with calcification. All of 9 arachnoid granulations showed low signal in T1WI and high signal in T2WI of MRI. 7 of them showed low signal in Flair sequence, 4 showed mild or moderate enhancement and filling defect sign. Filling defect was seen in cerebral MRV in 4 cases. Conclusion: Both CT and MRI are reliable methods to verify arachnoid granulations, but MRI is more useful in identifying their relation with venous sinuses.