Table 4

Neuroradiological features of CVT

CT + CT venographyMR + MR venography
Typical findingsSinus or vein hyperdensity
Dense triangle sign
Empty delta sign
Cord sign
Absence of flow in thrombosed sinuses
1 week: isointense on T1 and hypointense in T2W images
2 weeks: hyperintense on T1 and T2W images
>2 weeks: variable on T1 and T2, hypointense in GRE and SWI
DWI hyperintensity
Venous wall enhancement
Absence of flow in thrombosed sinuses
AdvantagesEasily available
Reduced motion artefact
No ionising radiation exposure
No contrast medium required
Good visualisation of brain parenchyma
Good for detection of cortical and deep cerebral vein thrombosis
DisadvantagesIonising radiation
Use of contrast medium
Poor detection of small parenchymal abnormalities
Low sensitivity in small cortical and deep thrombosis
Time consuming
Motion artefact can degrade images
Reduced availability
Contraindicated in some patients (eg, cardiac devices, medically unstable)
  • CVT, cerebral venous thrombosis; DWI, diffusion-weighted imaging; GRE, gradient recalled echo; SWI, susceptibility-weighted imaging; T2W, T2-weighted.