|Axial FLAIR and Mid sagittal T1 wt sequences: |
Mild FLAIR hyperintensity in right frontal cortical and subcortical region.
Hyperintensity along the anterior aspect of superior sagittal sinus on T1.
|TOF MR venogram revealed thrombosis of anterior aspect of superior sagittal sinus. |
DWI revealed restricted cortical diffusion in right superior frontal gyrus-
suggestive of acute venous infarct due to superior sagittal sinus thrombosis.
neoplastic invasion or compression.
oral contraceptive use, and hypercoagulable states secondary to
parenchymal changes observed at imaging than in those without such
white matter of the frontal, temporal and parietal lobes, corpus callosum,
upper brainstem, basal ganglia and the thalamus.
patients with dehydration, an elevated hematocrit level, or a subjacent
subarachnoid or subdural hemorrhage.
attenuation can help differentiate between a physiologic increase in sinus
attenuation and increased attenuation due to thrombosis.
varies according to the interval between the onset of thrombus formation
and the time of imaging.
Stage of bleed/sequence
acute-stage thrombosis, when the signal intensities on
T1- and T2-weighted images may be more subtle.
as either primarily vasogenic edema (with increased ADC values
presumably related to venous congestion) or primarily cytotoxic edema
(with decreased ADC values related to cellular energy disruption).
while those with normal or increased ADC values usually do not.
secondary to venous occlusion are reversible.
on images may occur. Such patients typically have more prominent clinical
symptoms than would be expected on the basis of imaging findings.
adjacent leptomeningeal enhancement, and prominent cortical venous
enhancement (secondary to venous congestion) also may be visible.
frontal and parietal lobes are typical findings in patients with
superior sagittal sinus thrombosis.
may extend into the caudate regions and deep white matter.
cortical venous thrombosis on CT and MRI respectively.
Ref: Imaging of Cerebral Venous Thrombosis: Current Techniques, Spectrum of Findings, and Diagnostic Pitfalls Radiographics
October 2006 26:suppl 1 S19-S41; doi:10.1148/rg.26si055174
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