MRI
Aneurysmal dilatation of a midline venous pouch, most likely median prosencephalic vein (32mm maximum diameter), with dilated straight sinus, the bilateral sigmoid sinus, the bilateral transverse sinus, the confluence of sinuses (torcula herophili – 35.2mm), and the right jugular bulb (12mm). No significant dilation of the superior sagittal sinus but dilated cortical veins drains to the superior sagittal sinus.
Significant brain volume loss with diffuse subcortical white matter and bilateral basal ganglia hyperintensities on T1 with areas of FLAIR hyperintensities in the right frontal cortex and thalami. Thinning of the corpus callosum and collapsed supratentorial ventricular system.