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This diagram shows normal basilar artery in yellow and the red, green and blue ones are abnormal.

  • Basilar artery is the main artery that supplies our brainstem.

  • Red one is longer, larger and tortuous than normal, it is called “dolichoectasia”.

  • Green one is larger in certain spot only, it is called “fusiform aneurysm”.

  • Blue one is larger than normal but also has focal spot that larger than the rest, it is called “transitional aneurysm”.

  • This abnormal artery could grow over time or cause bleeding in the brain or cause the compression on the brainstem or nerve nearby. Blood clots could form inside the aneurysm and block the blood flow to the brain (ischemic stroke).

  • Patient with this kind of artery (dolichoectasia or fusiform or transitional aneurysm) needs regular monitoring with his doctor. 

  • Not all patients require treatment. Each patient is different. 



1) Case courtesy of Assoc Prof Frank Gaillard, <a href=""></a>. From the case <a href="">rID: 36155</a>

2) Bhogal P, Pérez MA, Ganslandt O, et al. J NeuroIntervent Surg 2017;9:471–481.

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