Accessory middle cerebral artery and ICA aneurysm

Case contributed by Dr Giuseppe Lanni

Presentation

Worsening headache, no neurological deficits

Patient Data

Age: 39
Gender: Female

In the case proposed, headache is probably due to the left ICA aneurysm. Moreover it's interesting to notice the presence of a right accessory middle cerebral artery.

Case Discussion

An accessory middle cerebral artery is an artery that arises from the anterior cerebral artery and courses parallel to the M1 segment of the middle cerebral artery. This variant has a reported prevalence of 2.7%.

An accessory middle cerebral artery should be distinguished from a duplicated middle cerebral artery. 

The former is a smaller middle cerebral artery branch arising from the anterior cerebral artery while the latter is a smaller middle cerebral artery branch arising from the distal carotid artery.

The accessory middle cerebral artery may provide collateral blood supply to the distal middle cerebral artery territory in the presence of middle cerebral artery occlusion.

Because an aneurysm may occur at the origin of an accessory middle cerebral artery, this variant is clinically much more significant than a duplicated middle cerebral artery.

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Case information

rID: 22656
Case created: 14th Apr 2013
Last edited: 9th Sep 2015
Inclusion in quiz mode: Included

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