Long terminal internal carotid artery mimicking an aneurysm
Incidental right ICA aneurysm on CT brain.
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The right internal ICA is longer than the left, extending more superiorly into the sylvian fissure which mimics an aneurysm. No aneurysm or infundibulum is evident.
No other aneurysm identified. Left fetal P-comm.
No restricted diffusion. The remainder of the study is unremarkable.
Here the terminal right ICA is abnormally long and higher than usually, representing an anatomic variant. You can understand how it was mistaken on a non contrast CT and even the T2 MRI as an aneurysm.