vasa vasora get more abundant, and they may also develop in
patients with pathologies like vasculitis, aneurysms, and ath-
erosclerosis. When vasa vasora are the only causative factor
for the enhancement in the intracranial vessel wall, this would
imply that the entire vessel tree will enhance in older patients
and patients with atherosclerosis. We do, however, not observe
abundant enhancement of the intracranial vessels. This may
suggest that different mechanisms are involved in the intracra-
nial vessel wall enhancement.
Asymptomatic and symptomatic lesions were found to have
a different morphological feature. The asymptomatic lesions