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Question: Circle of Willis 

Question: Circle of Willis
Question: Circle of Willis
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date: 23 September 2021

An MR angiogram of the Circle of Willis is shown here (Fig. 17.1). Identify the labelled structures.

A = Left vertebral artery; B = Right vertebral artery; C = Right anterior inferior cerebellar artery (AICA); D = Basilar artery; E = Superior cerebellar artery (SCA); F = Left posterior cerebral artery (PCA); G = Arrowhead on the right internal carotid artery (ICA): the right posterior communicating artery (PCom) can be seen branching off the right PCA and advancing anteriorly past the tip of the arrow; H = Left internal carotid artery; I = Left internal carotid artery at the bifurcation into the anterior cerebral and middle cerebral arteries; J = Left anterior cerebral artery (ACA); A1 segment (proximal to anterior communicating artery); K = Left middle cerebral artery (MCA); M1 segment (proximal to bifurcation); L = Anterior cerebral arteries; A2 segment (distal to anterior communicating artery); M = Anterior communicating artery (ACom); N = Bifurcation of right middle cerebral artery. The posterior inferior cerebellar artery (PICA) (not shown in this image) usually branches off the distal part of the vertebral arteries....

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