Table 3.

Studies comparing CT venography versus MRI and MR venography for the diagnosis of CVT.

References	Total number of patients	Number of patients with suspected CVT	CVT confirmed by CT venography	CVT confirmed by MR venography	Comment
Casey et al.27	33	18	7	5	CT venograms easier to interpret, fewer artifacts
Ozsvath et al.28	24	17	8	8 (but TS thrombosis not seen in one patient)	CT venography more frequently visualises sinuses or smaller cerebral veins with low flow as compared with MR venography
Khandelwal et al.29	50	50	30	30	Total number of sinuses involved were 81 (CT venography) and 77 (MR venography) When using MR venography as the gold standard, CT venography had both a sensitivity and a specificity of 75–100%, depending on the sinus and vein involved.

CT: computed tomography; CVT: cerebral venous thrombosis; MRI: magnetic resonance imaging; TS: transverse sinus.