Diffuse
hypointense areas on the T1W images which turn hyperintense on
the Proton & T2W images are noted in the left parietal lobe. An
area which is predominantly hypointense with a hyperintense rim
on all sequences is noted in this lesion (subacute blood). The
lumen of the superior sagittal sinus shows a hyperintense signal
(no flow on the MRV-images not available) representative of a
thrombus in this case.
On
MRI:
·
Diffuse distribution, not conforming to vascular territories (as
seen with arterial infarcts).
·
Hemorrhage may be present (20%).
·
May find a lack of the normal flow void within a dural venous
sinus (e.g. in the superior sagittal sinus).
·
Gyral/Wedge shaped enhancement (32%).
·
May see intense tentorial enhancement (collateral's/venous
stasis).
·
May see dilated transcerebral medullary veins (connecting the
superficial cortical veins with the subependymal veins).
·
In the late stage, there will be encephalomalacic changes.
|