Trifurcated middle cerebral artery

Case contributed by Dr Muhammad Shoyab


Transient weakness of left lower leg.

Patient Data

Age: 50 years
Gender: Female

MR Cerebral Angiogram


M2 segment of left middle cerebral artery divides into three branches instead of two.

MRA 3D Reconstruction

Annotated image

Case Discussion

The commonest pattern (around 80%) of branching of the MCA is by bifurcation of the M2 segment into superior and inferior divisions. About 10% make trifurcations and another 10% split into more than three branches.

One implication of such branching pattens is that the point of division is prone to aneurysms and pseudoaneurysms.

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